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来源：雅诚德英语网
If the small-brained australopithecines were not toolmakers, what evolutionary advantage did they gain by walking upright?
如果脑子比较小的古猿不是工具制造者，那他们直立行走的进化优势是什么？
If the small-brained australopithecines were not toolmakers, what evolutionary advantage did they gain by walking upright?
如果脑子比较小的古猿不是工具制造者，那他们直立行走的进化优势是什么？