Carbonel卡尔博内尔carbonn.碳；复写纸；复本；碳精棒carbon fiber material碳纤维材料carbon monoxide index一氧化碳指数carbon-fiber fabric碳纤维织物carbonitride alloying氮碳合金化carbon microelectrode碳微电极carbon fiber laminate碳纤维薄板carbonizing of engine发动机积碳carbon nanotubes film碳纳米管Carbon fibres textile碳纤维布carbon slide material碳滑板材料

1. It is very necessary to make sure that the carbon brushes stay in good contact with the commutator.
   确定一下碳刷与换向器是否保持良好的接触，是非常必要的。