你能弯曲你的左手肘向后？

Can you bend your left elbow backwards?

youdao

我坐在我的脚趾，而且向后弯曲！

I sat on my toe and it bent backwards!

youdao

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。

When you bend your elbow, you contract the muscles of the arm.

youdao

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。

When you bend your elbow, you contract the muscles of the arm.

youdao