In some countries people stand close enough to touch elbows...

在某些国家人们站得很近，足以挨到臂肘。

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Bend elbows and touch shoulders, then straighten with PALMS up. Check that the wrists can move fully up and down.

弯曲肘部并触摸肩膀，然后伸直手心向上。检查手掌是否可以上下的旋转。

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The elbow bump is an informal greeting where two people touch, or tap, elbows.

撞肘是一种非正式的问候方式，两个人通过肘部轻触或者撞击来问候对方。

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The riders, whose bikes cost millions of dollars, get so close to the ground when racing that they not only touch the tarmac with their highly-padded knees, but also their elbows.

CNN: Motorbike champion Jorge Lorenzo dances with danger