Piston plated by 0.5-3u tin on the surface in chemical way ,the tin layer with little hole has the lubri-cative quality of soft meta...是什么意思_Piston plated by 0.5-3u tin on the surface in chemical way ,the tin layer with little hole has the lubri-cative quality of soft meta...在线翻译_英语_读音_用法_例句