To be subtly and gradually influenced or affected over a long period by one's surroundings or external factors, leading to a change in character, habits, or understanding.
他长期在图书馆工作，日濡月染之下，对各种书籍都有了深入的了解
Having worked in the library for a long time, he gradually became deeply knowledgeable about various books through daily and monthly immersion.
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