necessary evil

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Spam filtering solutions are a necessary evil in today's e-mail climate.
在如今的电子邮件时代中，垃圾邮件过滤解决方案是非常重要的。
Members of an ad hoc student committee wore black T-shirts with a quotation from Edmund Burke: “All that is necessary for the triumph of evil is that good men do nothing.”
学生临时组成的委员会成员穿了黑色T恤，上面印着埃德蒙-柏克的话：“邪恶获胜，只因善者袖手旁观”。
In Paris the idea that a free-market liberal may believe he is defending a moral position (rather than a necessary evil) often causes surprise.
在巴黎，自由市场主义者可能相信他是在防守道义立场（而不是必要之恶）的观点时常令人咋舌。

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
The fixtures throughout the Lodge are entirely done by Rocky Mountain Hardware--understated sand-cast bronze with a natural coating that allows the metal to blend into its environment--and in the mercifully small and hidden salon (a necessary evil in all spas) for sanitary reasons, the pedicure areas use copper basins and no jets.
FORBES: Magazine Article

something unpleasant that must be accepted in order to achieve a particular result