这句是在 has been supposed 前省略了 what
意思是人类似乎早就在关注并尝试了解季节（的变化）,比原先设想的还早了2万年.
It seems that man was making a real effort to understand the
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It seems that man was making a real effort to understand the
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这里是否省略了主语It seems that man was making a real effort to under
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