The complex protecting film composed of FeSO4, FeS, B2O3, N-B-O and O-Fe-B contributed to improve the tribological behavior of the lubricant.是什么意思_The complex protecting film composed of FeSO4, FeS, B2O3, N-B-O and O-Fe-B contributed to improve the tribological behavior of the lubricant.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句