a necessary evil是什么意思

词组

a necessary evil

释义

●a ˌnecessary ˈevil

a thing that is unpleasant or even harmful, but which must be accepted because it brings some benefit （要获得好处而无法避免的）不得已的事；必要之弊害

◆Injections against tropical illnesses are a necessary evil when you are planning to travel to that part of the world.如果你要去热带旅行，打热带病预防针虽然很麻烦，但却是必不可少的。

◆I suppose all these security measures are a necessary evil.我想所有这些安全措施虽令人厌烦，却都是必不可少的。

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