单词：muscle contraction
muscle contraction的用法和样例：
例句
- The heart muscles contract to expel the blood.心脏肌肉收缩以挤压出血液。
- When the muscle between the bones shortens, one bone has to move.但当肌肉收缩时只有一块骨头运动。
- muscular contraction肌肉收缩作用...
- contraction收缩
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