过去的将一去不复返 » The past will be gone forever 直立行走 » Walking upright 宁波港是上海国际航运枢纽港的重要组成部分，已与世界上216个国家和地区的600多个港口开通了航线。
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upright walking 比如直立行走
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？
In other words, a long-ago ancestor species that spent its time in the trees moved to the ground and began walking upright.
换句话说，我们的祖先很久以前是活动在树上的，后来下到地面，开始直立行走。
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