You have to be cruel to be kind.
你不得不先忠言逆耳。
A dentist has to be cruel to be kind.
牙科医生是为仁术而不得不残酷的。
Sometimes you must be cruel to be kind, and so the teacher made Jones stay in after class to teach him a lesson!
有时你必须心慈手辣, 下课后老师要哈利留下来教训一下他。
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