A profound and intimate relationship, like that between fish and water, signifying deep mutual reliance and affection, often used to describe a loving couple or close friends.
他们夫妻几十年如一日，彼此间有着深厚的鱼水之情，令人羡慕。
They have been married for decades, sharing a profound and intimate bond as close as fish and water, which is truly admirable.
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