engine pickling

例句：

1. 1. The engineers were busy inspecting the new engine pickling process.
   工程师们忙于检查新的引擎冷却过程。
2. 2.The car was overheated and needed to be cooled down before it could be driven again.
   这辆车过热了，需要冷却后才能再次驾驶。
3. 3. The factory had to shut down for a few hours while they worked on their new engine quenching system.
   工厂在他们的新的发动机冷却系统工作期间不得不关闭几个小时。