13 年前
视频简介
为纪念中国人民志愿军抗美援朝出国作战70周年，中央广播电视总台制作六集大型纪录片《英雄儿女》。。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 ...。
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励志
亲子
儿童益智
犯罪
