dud [dʌd]

例句:

• He replaced a dud valve.
  他换掉了坏阀门。
  来自柯林斯例句
• 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.
  
• The Poe theme is a pretty much a dud, though.
  来自WSJ
• Less alluring is Manhattan, the only dud amongst a good collection.
  来自BBC
• Neil has reloaded his gun from the same box of dud ammunition.
  来自SA