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三生:佛家指前生、今生、来生;幸:幸运。三世都很幸运。比喻非常幸运。
[a stroke of luck;be fortunate in three lifetimes;be lucky indeed to meet with extraordinary fortune;consider oneself most fortunate] 形容极其幸运 事有奇缘,曰三生有幸。——《故事成语考·人事》