on their back legs 靠他们的后腿
"Flamingos have evolved very leathery skin on their legs so they can tolerate the salt water," says David Harper, a professor at the University of Leicester.
莱斯特大学教授戴维·哈珀表示:“火烈鸟的腿上已经进化出了非常坚韧的皮肤,这样它们就可以忍受盐水。”
The chimps were measured both while walking upright and while moving on their legs and knuckles.
研究人员对大猩猩在直立行走和四肢着地行走时消耗的氧气量分别进行了测量,并将结果与人类的进行了对比。
In an instant, the other two were on their legs, and all were actively engaged in busy preparation.
眨眼间,另外两个人也站了起来,一齐风风火火地投入繁忙的准备。
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