A metaphor for things that are extremely transient, ephemeral, or leave almost no trace, easily disappearing.
童年的快乐时光就像鸟迹虫丝，稍不留意就溜走了，只留下模糊的记忆。
The joyful moments of childhood are like bird tracks and insect threads, they slip away unnoticed, leaving only vague memories.
Era:
Early Modern
Frequency:
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