gēng / huàn / tū / lún / zhóu / hòu / qì / chē / de / fā / dòng / jī / yùn / xíng / píng / wěn / duō / le更换凸轮轴后,汽车的发动机运行平稳多了。After the camshaft was replaced, the car's engine ran much more smoothly.