Past events are like a goose's prints in slush — gone in the blink of an eye.
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From Su Shi's poem 《和子由渑池怀旧》: 人生到处知何似，应似飞鸿踏雪泥 — 'What is life like wherever it goes? Like a wild goose treading on snowy slush.' The fleeting prints became the chengyu 雪泥鸿爪.
