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