contraction fissure

例句：

1. 1. The contraction ofthe muscles causes pain.
   肌肉的收缩导致疼痛。
2. 2. The contraction of the economy isslowing down.
   经济的收缩正在放缓。
3. 3. Thecontraction of the lungs can bea sign of illness.
   肺部的收缩可能是疾病的一个迹象。