spentadj.失效的;精疲力竭的动词spend的过去式和过去分词
spent coffee咖啡残渣
spent grains酒糟, 废麦糟
spent solvent用过的溶剂
spent sorbent废吸附剂
spent sources废源
spent catalys废催化剂
spent reagent废试剂
spent cathode废阴极
spent caustic废碱,废烧碱
spent residue废物