柯林斯词典bitumen /ˈbɪtjʊmɪn/ 1. N-UNCOUNT Bitumen is a black sticky substance which is obtained from tar or oil and is used in making roads. 沥青; 柏油 返回 bitumen剑桥词典a black , sticky substance such as tar or asphalt , used for making roads and roofs 沥青 返回 bitumen