crankcase front main section

例句：

1. 1. The car's crankcasefront main section is damaged in the accident.
   汽车的曲柄箱前部主室在事故中受损。
2. 2. Themechanics were working onthe crankcase front mainsection when the engine stopped.
   当引擎停止时，机械师们正在修理曲柄箱前部主室。
3. 3. Thecrankcase front main section of theengine needs to be replaced soon.
   发动机的曲柄箱前部主室需要尽快更换。