Taivo A Taiwan Mandarin dictionary

鐵樹開花

tiěshùkāihuā

ㄊㄧㄝˇ ㄕㄨˋ ㄎㄞ ㄏㄨㄚ

Simplified 铁树开花

  1. 1lit. the iron tree blooms (idiom)
  2. 2a highly improbable or extremely rare occurrence

Keep 鐵樹開花 and it comes back until you know it.

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