这是七万年以来人口数字第一次，由于各种各样的原因达到一个稳定的状态。

For the first time in 70,000 years, for lots of reasons, human numbers will have reached a steady state.

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来，让我们试试第一个数字！

Come, let's try the first figure!

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窦腔周围骨骼的第一个数字设计实际上与未受伤的人类头骨惊人地相似。

The first digital designs of the bones surrounding the sinus cavity actually bore a striking resemblance to an uninjured human skull.

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