hopper ring gear

例句：

1. 1.The engineer designed a new type of hopper ring gear for the mining machinery.
   工程师为采矿机械设计了一种新型的跳板齿轮。
2. 2. The new hopper ring gear has significantly improved the efficiency of the machine.
   新型跳板齿轮大大提高了机器的效率。
3. 3. The engineer explained that the hopper ring gear plays an important role in the operation of the mining machinery.
   工程师解释说，跳板齿轮在采矿机械的操作中起着重要作用。