un-, 使相反，bend, 弯。原义为松开弓弦，引申词义放松，拉直。

1. Most professors unbend outside the lecture theatre.

教授在课下大都很随便.

2. She finds it hard to unbend, even at parties.

她发现即使在派对上都难以松弛.

3. And the chest strength unbend two arms with the arm department, supports the body.

用臂部及胸部力量伸直两臂, 将身体支撑起来.

4. He is lying on his back, both hands puts either side, double foot unbend.

他仰卧着, 双手放两旁, 双脚伸直.

5. 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.