The paper studied the fault mechanism of the automotive engine timing chain as well as the worn surface morphology of the rubbing pair of bush and pin and roller based on the analysis of test.是什么意思_The paper studied the fault mechanism of the automotive engine timing chain as well as the worn surface morphology of the rubbing pair of bush and pin and roller based on the analysis of test.在线翻译_英语_读音_用法_例句