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故事紧接前三部。萌犬的家族越发壮大了，泰妮结婚了，生下了可爱的萌犬宝宝辛迪、罗希、查理和布罗迪。隆冬将至，泰妮迫不及待要跟自己的宝宝们共度他们降生后的第一个圣诞节。然而，比起和家人共度美好时光，小家伙们似乎更热衷于拼命搜刮礼物。为了让孩子们体会到圣诞节的真正含义，泰妮和老公筹划了一场萌犬好声音圣诞节特别节目，向家人演唱圣诞颂歌，并请来了神奇的圣诞老人和他的驯鹿！。这部引人入胜的纪录片探究了温斯顿·丘吉尔在二战中发挥的关键作用，解析他的人生经历如何将他塑造成时代所需的理想领袖。。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 ...。