吸气，抬起上半身就好象要站起来一样，伸直手肘。
With an inhalation, lift your torso as if you were going to stand up again, straightening your elbows.
延伸手臂向前，保持手肘伸直。
你要拿起洗发水，手臂向上伸直，紧贴耳朵，然后只要将手肘向后弯曲90度，再将手肘伸直。
So you want to take your shampoo, hold your arm straight up, keep your arm right next to your ear, and then simply bend your elbow to ninety degree, and then lift it back up.
肱三头肌使手肘伸直。
肱三头肌使手肘伸展，伸直手臂。
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.
手肘伸直与手肘弯曲呈90度的状态各做一组。
Perform one set with elbow straight and one set with elbow bent at 90 degrees.
从肱骨到尺骨的三头肌是要使前臂从肘关节处伸直，屈肌则是使手肘弯曲。
The triceps muscle straightens the forearm at the elbow joint; the brachialis and biceps muscles bend it.
从肱骨到尺骨的三头肌是要使前臂从肘关节处伸直，屈肌则是使手肘弯曲。
The triceps muscle straightens the forearm at the elbow joint; the brachialis and biceps muscles bend it.
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