adj.無價(jià)值的
n.啞彈；無用的人或物
（復(fù)數(shù)）duds: 衣服；個(gè)人物品.
How can we be expected to carry out our jobs with the dud equipment you gave us? 你怎么能指望我們用這些你給的爛設(shè)備來完成工作呢？
用作名詞 (n.)This battery is a dud. 這電池是廢的。
The new manager is a complete dud. 新經(jīng)理完全是個(gè)廢物。
The whole plan turned out to be a dud. 整個(gè)計(jì)劃到頭來完全失敗了。
Two of the fireworks in the box were duds. 盒子里的煙火有兩個(gè)是壞的。
