rotary gill roving frame

例句：

1. 1. The rotaryvalve is used to control the flow ofgases.
   旋转阀用于控制气体的流量。
2. 2.The rotary saw is a versatile toolfor cutting wood.
   旋转锯是一种多功能的工具，用于切割木材。
3. 3. The rotary drillhas a variable speed feature that makes iteasy to adjust the depth of cut.
   旋转钻具有可变速功能，使调整切削深度变得容易。