xiū / lǐ / gōng / jiǎn / chá / fā / dòng / jī / shí / fā / xiàn / tū / lún / zhóu / yǐ / jīng / yán / zhòng / mó / sǔn

修理工检查发动机时发现凸轮轴已经严重磨损。

The mechanic found that the camshaft was badly worn while inspecting the engine.