Read Edit View history 铁树开花 tiěshùkāihuā rarity Origin Definitions Defs Strokes Stroke Words Sentences Sents created sense approved 铁树开花/鐵樹開花 · tiěshùkāihuā · rarity 2026/03/04 铁树开花 / 鐵樹開花 tiěshùkāihuā rarity a highly improbable or extremely rare occurrence; something that happens once in a blue moon 他这种守财奴竟然主动捐款，真是铁树开花。 created sense Mar 4, 2026, 02:25 AM