对人类种群起源和分布的研究曾是基于考古和化石证据。
Study of the origins and distribution of human populations used to be based on archaeological and fossil evidence.
人类是怎么能直立行走的呢，有个理论说，在我们的族群起源时，人们能够攀到树上采摘果子是件幸运的事情。
One theory for how this might have happened says that, when our species was just getting its start, reaching up for fruit was a good thing to be able to do.
人类是怎么能直立行走的呢，有个理论说，在我们的族群起源时，人们能够攀到树上采摘果子是件幸运的事情。
One theory for how this might have happened says that, when our species was just getting its start, reaching up for fruit was a good thing to be able to do.
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