concave clearance lever

例句：

1. 1.The car's engine is a concave clearance lever that helps it run smoothly.
   汽车的引擎是一个凹面清除杠杆，有助于它顺畅运行。
2. 2. The engineer used a concave clearance lever to remove the blockage in the pipe.
   工程师使用一个凹面清除杠杆来清除管道中的堵塞。
3. 3.The concave clearance lever was designed to prevent the vehicle from tipping over.
   凹面清除杠杆的设计是为了防止车辆翻倒。