cylinders castin-pair

例句：

1. 1.The car has two large cylinders in the back.
   这辆车后部有两个大圆柱。
2. 2.The pipe ran through the wall and out the other side.
   管子穿过墙并从另一边出来。
3. 3.The cylinder is used to store liquids.
   这个圆柱用来储存液体。