She had to concentrate on flexing her pectoral muscle, or the triceps, to power the arm.

为了给手臂提供力量，她不得不用力伸缩她的胸肌或者三头肌。

She had to concentrate on flexing her pectoral muscle or the triceps to power the arm.

为了给手臂提供力量，她不得不用力伸缩她的胸肌或者三头肌。

She had to concentrate on flexing her pectoral muscle or the trice ps to power the arm.

为了给手臂提供力量，她不得不用力伸缩她的胸肌或者三头肌。

This exercise develops literally every tract of the pectoral muscle, but requires some proper warm up.

这个练习几乎锻炼所有各部分胸肌，但事先需要热身。

He eventually hurt his pectoral muscle and rumor saying that he had to undergo an operation in hospital.

他最终会损害他的胸肌和谣言说他接受了手术治疗。