It's this right arm extension that gives your swing power and extra accuracy, and makes chicken-winging almost impossible.

右臂伸展增加了挥杆的力量和准确性，使得你几乎不可能出现鸡翅膀。

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We swing our arms simply because it would take extra mental and physical effort to keep them still, says Herman Pontzer, a biomechanics researcher at Washington University in st Louis.

根据圣路易斯华盛顿大学生物力学专家Herman Pontzer的说法，我们之所以要摆臂，是因为不这样的话就需要在意识上以及生理上额外花些气力才能使得手臂保持静止。

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The top of the mountain, he felt, called for an extra-long swing that would make kids feel as if they were flying toward the lake.

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That has needed the extra bounce of nature's ecosystem swing.

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The opening hour proved frustrating for England, featuring two interruptions and just 7.1 overs of actual cricket, but the rain was actually beneficial to the bowlers as it added some spice to the wicket, providing both swing and a bit of extra pace.

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