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。
Though Ardi would have spent much of her time in the trees, her pelvis was adapted to walking upright when she came down to the forest floor.
尽管阿迪一生中大部分时间也许是在树上渡过的，但当她下到森林地面上时，她的骨盆是适合直立行走的。
The female, named Ardi by the researchers who worked on her, belongs to a new species Ardipithecus ramidus and may be the earliest human ancestor ever discovered that was capable of walking upright.
研究员们给这名女性起名叫阿迪（Ardi），阿迪属于一个名为阿迪猿科分支（Ardipithecusramidus）的新物种，她可能是迄今为止发现的能直立行走的最早的人类祖先。
Walking upright permitted the father to use his hands to gather food and carry it to his mate from a distance.
直立行走使父亲可以用手收集食物并从远处把食物带给他的配偶。
Walking upright is a complex skill, which takes about seven years for most people to master, according to Humphrey.
汉弗莱说直立行走时一种综合技能，大部分人需要大约7年左右的时间才能掌握。
Walking upright is a complex skill, which takes about seven years for most people to master, according to Humphrey.
汉弗莱说直立行走时一种综合技能，大部分人需要大约7年左右的时间才能掌握。
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