20 年前
视频简介
故事讲述了人与熊的感恩故事，熊爸爸被人类杀害，小熊长大后人类再次捕捉它，再与人类多次较量后，女主角不小心掉到冰窟窿里，被小熊救起，从此人类与熊成为了好朋友，动物也是通人性的，小熊不计前嫌。教育孩子有颗感恩的心。。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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