天下没有白吃的午餐 there is no free lunch ; No Free Lunch Rule ; Nothing in life is free
天下沒有白吃的午餐
There is no such thing as a free lunch in the world
以上为机器翻译结果，长、整句建议使用 人工翻译 。
放水与诱饵，天下没有白吃的午餐，要捞好处就必须有付出。
Water and the bait, there is no free lunch, want to get benefits, you must have to pay.
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经济学家会说天下没有白吃的午餐，别的人则会说好东西来之不易。
Economists will say that there is no free lunch. Others will say that nothing good in life comes easy.
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