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。
Train Triceps, avoid loose, flabby upper arm. Improve muscle tone.
练习肱三头肌，防止上臂肌肉松弛。
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。
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