triceps muscle of arm

例句：

1. 1.The athlete's triceps are visible as he lifts the barbell.
   当运动员举起杠铃时，他的三头肌可见。
2. 2.She lifted her arms above her head and stretched her triceps.
   她把手臂举过头顶，伸展她的三头肌。
3. 3.The gymnast performed a triple somersault with her triceps extended.
   体操运动员用三头肌做了一个倒立。