mechanist

例句：

1. 1. The engineer designed the new machine for efficiency.
   这位工程师为提高效率设计了新机器。
2. 2.The mechanic fixed the car's engine and replaced the brakes.
   这位机械师修理了汽车的引擎，更换了刹车片。
3. 3. Mechanists are responsible for maintaining machinery and ensuring safety.
   机械师负责维护机械设备并确保安全。