■ (Don't give up the) ship!

由于历史关系，英语中有关航海的用语较多。Don't give up the ship! （不要弃船！）也可以用于同航海无关的场合，表示“要坚持，不要打退堂鼓”。

• —I'm having a devil of a time with calculus. I think I want to drop the course.
  —Keep trying. Don't give up the ship.
  —微积分把我弄得好苦。我想还是退出不学这一门课吧。
  —继续试试看。别打退堂鼓。