在20年的绝大部分时间里，我一直在撰写和谈论太空飞行，突然将兴趣转向海洋深处，确实显得很奇怪。
As I have been writing and talking about space flight for the best part of 20 years, a sudden switch of interest to the depth of the sea does seem peculiar.
在20年的绝大部分时间里，我一直在撰写和谈论太空飞行，突然对深海探险者的兴趣发生了转变，这似乎有些奇怪。
As I have been writing and talking about space flight for the best part of 20 years, a sudden switch of interest to the depth of the sea doer seem peculiar.
人类在地球上生存的绝大部分时间是当采猎者。
HUMAN beings have spent most of their time on the planet as hunter-gatherers.
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