柯林斯詞典bitumen /?b?tj?m?n/ 1. N-UNCOUNT Bitumen is a black sticky substance which is obtained from tar or oil and is used in making roads. 瀝青; 柏油 返回 bitumen劍橋詞典a black , sticky substance such as tar or asphalt , used for making roads and roofs 瀝青 返回 bitumen