To be in an unpleasant or negative environment for a long time and gradually become unaware of its negative aspects or influence; to become accustomed to something bad.
他初到这个部门时，对那些不规范的做法很不适应，但久而久之，也如入鲍鱼之肆，久而不闻其臭了
When he first joined the department, he was very uncomfortable with the irregular practices, but as time went on, he became accustomed to them, just as one who enters a fish market eventually no longer smells its odor.
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