伸直的英文：
unbend

Extended legs with thighs
双腿伸直

The muscle bending a joint is antagonistic to the muscle straightening it.
关节的弯曲肌与伸直肌彼此牵制。

Keep it extended.
保持伸直耳机导线。

To unbend the arm other muscles in the back of the arm have to shorten.
要伸直手臂，背面的肌肉就得收缩。

Try stretching your legs and pulling your toes upwards.
试着双腿伸直并且向上拉伸脚趾。

They raised their hands up straight, so that the teacher could see them.
他们把手举起来伸直，好让老师看见。

To release(a bow,for example)from flexure or tension.
伸直放开弯曲或拉紧的(如，弓)

Bigger took a piece of newspaper and gingerly lifted the rat by its tail and held it out at arm's length
别格拿了张报纸裹着，小心翼翼地拎起老鼠的尾巴，伸直胳膊远远地提着。

He came down holding the hive at arm's length, behind which trailed a cloud of bees.
他伸直胳膊托着蜂箱从梯子上下来了，后面跟着一大群蜜蜂。

unbend a paper clip.
拉直纸夹

This kind of wire is easy to unbend.
这种金属线很容易弄直。

unbend the mind from absorbing too much information.
不要使脑筋过度地疲劳要注意放松一下自己的身体。

She finds it hard to unbend, even at parties.
她发现即使在派对上都难以放松。

To unbend the arm other muscles in the back of the arm have to shorten.
要伸直手臂，背面的肌肉就得收缩。