铁树开花 Traditional 鐵樹開花 tiě shù kāi huā 🔊 lit. the iron tree blooms (idiom) + Keep this word Meanings tiě shù kāi huā 鐵樹開花 lit. the iron tree blooms (idiom)a highly improbable or extremely rare occurrence Its characters 铁tiěiron (metal)HSK 7–9树shùtreeHSK 3开kāito open; to turn on; to driveHSK 1花huāflowerHSK 2