There is no such thing as a free lunch.

世上没有免费午餐之类的好事儿。

《牛津词典》

Ouch! It's my free lunch!

哎呀！这是我的免费午餐啊！

youdao

Everyone can have free lunch at our restaurants.

每个人都可以在我们的餐厅吃免费午餐。

youdao

figuring out there is no such thing as a free lunch but Markowitz tells us that diversification is a free lunch.

知道世上没有免费的午餐这回事,但马科维茨称分散投资是免费的午餐

耶鲁公开课 - 金融市场课程节选

As a matter of fact, Harry Markowitz called diversification a "Free lunch."

事实上,哈里·马科维茨,就把分散投资喻为"免费的午餐"

耶鲁公开课 - 金融市场课程节选

During the dotcom boom, the idea got about that there could be such a thing as a free lunch, or at least free internet services.

ECONOMIST: Internet companies

So, when it comes to the living wage, politicians are really looking for a free lunch: or rather, a free pay rise.

BBC: Living wage: Is there such a thing as a free pay rise?

It would be nice to think there is a "free lunch" available here - a cost-free way for the government to lend its good standing in the financial markets to worthy private projects, to make it easier for them to raise the money they need.

BBC: Mr Osborne's small plan for big infrastructure