柯林斯词典graphite /ˈɡræfaɪt/ 1. N-UNCOUNT Graphite is a soft black substance that is a form of carbon. It is used in pencils and electrical equipment. 石墨 返回 graphite剑桥词典a soft , dark grey form of carbon , used in the middle of pencils , as a lubricant in machines , and in some nuclear reactors 石墨 返回 graphite