19 年前
视频简介
NOVA: Mysteries of Sleep Like virtually every other animal, humans need sleep to survive. But why? What do we gain from spending nearly a third of our lives in such a defenseless state? And what's at stake if we sleep poorly? The functions of sleep have long been something of a mystery. But now scientists are peering deep into the brain to see what happens while we snooze. One ...。描述了解放战争时期，在敌后铁路线上的两代为祖国的解放事业，和敌人展开了斗争，终于完成了破坏敌人铁路运输的光荣任务，为朝鲜解放战争的胜利，作出了重大贡献。。
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