When a muscle contracts, the bone that moves is called the muscle's insertion point.

当肌肉收缩时，移动的骨骼称为肌肉插入点。

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。