機(jī)械工發(fā)現(xiàn)飛機(jī)的導(dǎo)航系統(tǒng)存在問(wèn)題。Mechanics discovered problems with the plane's navigation system.機(jī)械工給汽車軸上了潤(rùn)滑油.The mechanic greased the car's axle.機(jī)械工將發(fā)動(dòng)機(jī)中的油全部放走.The mechanic drained all the oil from the engine....