Traces or memories of past events, experiences, or friendships that are transient and hard to fully retain; fleeting imprints of the past.
多年以后，旧日的欢声笑语都成了鸿爪春泥，只留下淡淡的回忆。
Years later, the laughter and joy of old days have become like swan's prints in spring mud, leaving only faint memories.
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