muscle noun (BODY PART)
facial muscles 脸部肌肉
He flexed his muscles (= tightened them to make them look large and strong) so that everyone could admire them. 他将肌肉紧绷起来，这样大家就能欣赏到他的肌肉块。
pull a muscle
- The contraction of this muscle raises the lower arm.
- A work-out in the gym will exercise all the major muscle groups.
- He pulled a muscle in his groin.
- Barkley suffered a strained thigh muscle late in the preseason.
- I pulled a muscle in my back lifting some drawers.