rotary combustion engine of trochoidal form

例句：

1. 1.The rotary valve is used to control the flow of gases.
   旋转阀用于控制气体的流量。
2. 2.The rotary saw is a versatile tool for cutting wood.
   旋转锯是一种多功能的工具，用于切割木材。
3. 3. The rotary drill has a high speed and can be used for drilling holes in various materials.
   旋转钻具有高速，可用于在各种材料上钻孔。