muscus

例句：

1. 1. The muscles in his arms are sore from lifting heavy weights.
   他的手臂上的肌肉因为举重而酸痛。
2. 2.Muscles are the body's main energy-producing organs.
   肌肉是身体的主要能量产生器官。
3. 3. The doctor advised him to exercise regularly to strengthen his muscles.
   医生建议他定期锻炼以加强肌肉。