crankcase oil drain cock

例句：

1. 1.The mechanic replaced the crankcase oil drain cock to fix the engine.
   机械师更换了曲轴箱油排塞以修理发动机。
2. 2. The car was serviced and the crankcase oil drain cock was cleaned.
   汽车进行了维护，曲轴箱油排塞被清洗了。
3. 3.The technician found a blockage in the crankcase oil drain cock and cleared it out.
   技师发现曲轴箱油排塞中堵塞物并清除了它。