难免

"难免"是形容词，表示虽不希望事情发生但很难避免。而“不免”是副词，表示由于某种原因而自然产生某种结果。
As an adjective 难免 indicates that although one hopes the situation will not occur, it is hard to avoid. As an adverb, 不免 indicates that a result will be naturally produced because of some reasons.

例：很晚了，儿子还没有回家，妈妈不免有些担心。

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