bad coin

例句：

1. 1. The old coinsare worthless, so they'renot accepted at the museum.
   旧硬币毫无价值，所以博物馆不接受它们。
2. 2. He founda bad coin in his pocket and decidedto keep it as a memento.
   他在口袋里发现了一枚坏硬币，决定保留它作为纪念品。
3. 3. Thethief was caught becausehe had a bad coin thatmade him look like a thief.
   那个小偷被抓了，因为他有一枚看起来像赃物的坏硬币。