以下为句子列表：
英文: Contraction of front and side parts as cells die off was observed in some subjects in their thirties, but it was still not evident in some sixty and seventy-year-olds.
中文: 有的人(大脑)前部和侧部的收缩——随着细胞的死亡——在三十多岁时就能被观察到了，但是也有些人直到六七岁依然不明显。
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英文: In 8 years or less, crop after crop will die off leaving hundreds and thousands of humans starving in many places that have not known starvation in recent history.
中文: 在8年或更少时间中，一茬接一茬的庄稼将死去，将给近代历史上从未尝过饥饿滋味的很多地区留下数以万计处于饥馑之中的人们。
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英文: On the contrary, if the extinction of these mammals were due to climate change, elephants and mammoths should remain in regions already colonized by humans and would only begin to die off once climate change occurred.
中文: 相反，如果是气候导致了灭绝，那么在已经有人居住的地区，大象和猛犸象也仍然存在，直到气候变化来临。
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英文: There are things like burrows in some of the sediments found in layers above (after) the impact ejecta which can't easily be mimicked by a flood and imply many organisms survived the meteor impact to die off about 300,000 years later.
中文: 在一些冲击物中有类似洞穴的东西存在于冲积沉淀物的层面内，暗示了很多生物体经历流水影响之后幸存到大约30万年以后才消失。
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