Without dense forests, our ancestors were forced to walk instead of swing on a branch to find the next tree.

没有茂密的森林，我们的祖先被迫行走，而不是从一个树枝荡到下一个树枝。

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Next, Pontzer set out to show that real humans, not just Lego models, swing their arms passively when they walk.

接下来，Pontzer尝试证明：不仅乐高玩具小人，甚至真人行走时，双臂的摆动也都是被动的行为。

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The best kind of friend is the kind you can sit on a porch and swing with, never say a word, and then walk away feeling like it was the best conversation you've every had.

也许最好的朋友就是那些你坐在门廊下，看到的来回过往的行人。你与他们一言未语，走开时却感到好象有过最好的交谈。

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So we had to show them how to walk on trees and how to swing off of them onto other branches and see the little holes underneath that you can play in."

VOA: standard.2010.06.25

Gibbons are the exception, they can swing, walk and climb, and they can jump.

BBC: Gibbons' extraordinary jumps 'down to technique'

"They just sort of had the same swing to their walk, " she says.

NPR: Mother and Son Offer Transracial Adoption Insights

Led by a video projected on to a whiteboard nine children, a mix of Latinos and African-Americans, walk or jump on the spot, swing their arms, stretch and reach in an exercise class that lasts around 15 minutes.

BBC: Obesity rates fall in Philadelphia