trough of belt

例句：

1. 1. The car's troughof belt is worn out.
   这辆车的带槽磨损了。
2. 2. The engineer designed thetrough of belt for the machine.
   工程师为机器设计了带槽。
3. 3. The trough of belt is where the oil flows in and out.
   带槽是油进出的地方。