Higher taxes may be a necessary evil.

提高税率虽不是件令人愉快的事，但可能是必要的。

《柯林斯英汉双解大词典》

It is by and large a necessary evil.

总的来说，这是一种必要的邪恶。

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Meanwhile, government spending that would make everyone better off was being cut down because people instinctively—and wrongly—labeled government only as "a necessary evil".

与此同时，本可以让每个人生活更好的政府开支却被削减了，因为人们本能地——且错误地——将政府贴上了“必定邪恶”的标签。

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Early termination fees have always represented the flipside of subsidized pricing -- the necessary evil that keeps free phones free.

ENGADGET: FCC gives Verizon the third degree over $350 'advanced device' ETF

Unfortunately, they seem to be a necessary evil in this crazy supply-versus-demand world of capitalism we all call home, particularly in light of the spectrum crunch the FCC keeps warning us about.

ENGADGET: Cricket's new tiered data plans seem like a model for the industry to us

"While Defenders has always recognized that professional control of wolves that prey on livestock is a necessary evil, allowing random, non-selective take through public hunting and trapping is a poor wildlife management decision, " warned Nina Fascione, Defenders of Wildlife associate director of species conservation.

CNN: Defenders of Wildlife oppose gray wolf bill