It does us all good to unbend sometimes.
有时放松一下对我们大家都有好处。
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。
Finally, while straightening his legs, he'll unbend at the waist and be off.
最后，当腿伸直了，他伸直腰部就站起来了。
He has cerebral palsy and has already had seven operations to unbend his arms and legs.
他得了脑瘫，并接受了7次手术以矫正四肢。
Correct gesture for back swing is that the right upper arm's inside should be close to right armpit, while right elbow shapes an inverse triangle with unbend left arm.
正确的上挥杆姿势是右手上臂内侧应该紧贴右臂腋窝，右臂手肘与伸直的左臂呈一个倒三角形。然而一些球手在上杆的时候右臂向上抬起而并非紧贴身体。
Correct gesture for back swing is that the right upper arm's inside should be close to right armpit, while right elbow shapes an inverse triangle with unbend left arm.
正确的上挥杆姿势是右手上臂内侧应该紧贴右臂腋窝，右臂手肘与伸直的左臂呈一个倒三角形。然而一些球手在上杆的时候右臂向上抬起而并非紧贴身体。
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