额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额额
同类推荐
热门推荐
环保结锦（青少年科谱知识丛书）
科学是人类进步的第一推动力，而科学知识的普及则是实现这一推动的必由之路。在新的时代，社会的进步、科技的发展、人们生活水平的不断提高，为我们青少年的科普教育提供了新的契机。抓住这个契机，大力普及科学知识，传播科学精神，提高青少年的科学素质，是我们全社会的重要课题。为此，我们特别编辑了这套“青少年科普知识”丛书，主要精选现代前沿科技的各个项目或领域，介绍其研究过程、科学原理、发展方向和应用前景等，使青少年站在当今科技的新起点寻找未来科学技术的契入点和突破口，不断追求新兴的未来科学技术。
嫡女倾城：绝色大小姐
她21世纪商业奇才，却突然消失？没有人知道她去了哪里。华夏大地，月府嫡女，重生睁眼，异世灵魂，逆袭崛起。欺我者，以百倍还回，说我是废物？让你知道什么是真正废物。神兽？不好意思随随便便拿出一个圣兽！断我丹药？我自己练！断我神器？上古神器随便挑！抢我男人？好啊！你能抢走随便抢！他，愿为她放弃九天玄境，只为陪她异世蛰伏。
中老年医疗保健10000个为什么（中册）
为什么你容易得病？为什么你的健康状况时好时球？为什么你的治疗效果总是不尽如人意？ 这不单取决于你对疾病和健康的态度，更多的则取决于你对它们的了解程度。
