雪泥鸿爪（雪泥鴻爪）　

◎ 雪泥鸿爪 xuění-hóngzhǎo

[traces of the past;human life lihened to that of birds of passage with foot print on the sand] 雪地上偶然留下的鸿雁爪 印。比喻往事遗留的痕迹。也指人生际遇不定,踪迹无常