最近一组科学家，在研究人类最近的祖先为什么开始直立行走时，给出了给出了一副完整的拼图。
The puzzle pieces fit together recently for a team of scientists who studied why our closest ancestors stopped walking on all fours.
最近一组科学家，在研究人类最近的祖先为什么开始直立行走时，给出了给出了一副完整的拼图。
The puzzle pieces fit together recently for a team of scientists who studied why our closest ancestors stopped walking on all fours.
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