Meaning of 铁树开花

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tiě shù kāi huā (Trad.: 鐵樹開花)
lit. the iron tree blooms (idiom); a highly improbable or extremely rare occurrence
Related Words
Antonyms: 触目皆是
Example Sentences
We saw the meteors flew past, saw the sago cycads flowered .
I firmly believe there will be such a day, although it is less likely than sth. seldom seen or hardly possible but not easy.
Next time should challenge her with "Sago Palm", see if she is able to plant them until flowering. (Sago Palm is a plant that rarely rarely flowers).
None of this would be possible without standardized terminology, which allows us to speak with one voice.
Suddenly son seemed to see father smiled, as bright as flowering hornbeam.