单词	硬纸管
释义	硬纸管cardboard tube
随便看	carbon cohere carbon coherer carbon collector carbon color test carbon commutator carbon comparison tube carbon composition film potentiometer carbon composition resistor carbon-composition resistor carbon compound carbon compounds carbon contact carbon contact pickup carbon content carbon contents carbon-copied carbon copies carbon-copper contact film carbon copy carbon-copy carbon copy--cc carbon-copying carbon copy invisible carbon copy，cc carbon core