When you bend your elbow, the muscles of the arm contract.
当你弯曲肘部时，手臂上的肌肉就收缩。
When you bend your elbow , you contract the muscles of the arm.
你屈肘时，手臂的肌肉就会收缩。
When you bend your elbow, you contract the muscles of the arm.
要从肘部弯曲手臂，就要收缩上臂正面的肌肉。
When you bend your elbow, you contract the muscles of the arm.
同时肘部轻轻弯曲，胳膊向后伸，这样你的肱二头肌就压在耳边了。
We usually use elbow( bend, flange, tee, reducer) as a kind of pipe fitting.
我们常用弯头（弯管、法兰、三通、大小关）作为一种管件。
When you bend your elbow, you contract the muscles of the arm.
你屈肘时，手臂的肌肉就会收缩。
We usually use elbow (bend, flange, tee, reducer) as a kind of pipe fitting.
我们常用弯头(管、兰、通、小关)为一种管件。
We usually use elbow (bend, flange, tee, reducer) as a kind of pipe fitting.
另供应各种管道配件，如弯头、法兰等。
We usually use elbow (bend, flange, tee, reducer) as a kind of pipe fitting.
另供应各种管道配件，如弯头、法兰等。
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