there's no such thing as a free lunch said to emphasize that you cannot get something for nothing 天下没有免费的午餐 A: I get to travel with my job but the downside is I have to give talks. 我这份工作可以经常去四处走走，不过坏处是我得经常作报告。 B: Well, there's no such thing as a free lunch. 哎呀，天下没有免费的午餐嘛。 A: This advertisement says I can get an expensive camera for free! 这个广告说我可以免费得到一台昂贵的相机! B: Don't be so gullible. There's no such thing as a free lunch. 别那么容易上当。天下没有免费的午餐。