1. The lucky gambler won a big tref at the casino.
这位幸运的赌徒在赌场赢得了一大笔红利。
2. The four-leaf clover is considered a tref of good luck.
四叶草被视为好运的象征。
3. Their actions are a tref to everything we stand for.
他们的行为背反了我们所信仰的一切。