When she pushes herself up, her pectoralis major is contracting, pulling its insertion point — which in this case is the top of her humerus — toward the immobile origin, which is her sternum.
当她向上推时，她的胸大肌在收缩，将其插入点——在这种情况下是肱骨顶部——拉向不动的起源，也就是胸骨。
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