The hotel guard joked that a copper was waiting in the lobby to check guest IDs.

飯店警衛開玩笑說，有個條子在大廳等著查房客的證件。

In the crime novel our book club discussed, the thief calls every detective a copper.

我們讀書會討論的那本犯罪小說裡，小偷把每個警探都叫作條子。

The tour guide explained that old London films often use copper as slang for police.

導遊解釋說，老倫敦電影常用 copper 這個俚語來指警察。