dud的音标：dud的英式发音音标为：[dʌd]dud的美式发音音标为：[dʌd]...

He replaced a dud valve.他换掉了坏阀门。The mine was a dud.矿井废弃了。The new manager is a complete dud.新经理完全是个废物....

dud的复数形式为：duds...

n.[军]哑弹，无用的人或物，衣服，个人物品adj.无用的，不完善的...