Chinese

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Cycas revoluta, the king sago palm
to blossom; to bloom; to flower
to blossom; to bloom; to flower; to burst; to split open; to break open
 
trad. (鐵樹開花) 鐵樹 開花
simp. (铁树开花) 铁树 开花
Literally:king sago palm blossoms”.

Etymology

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From the fact that king sago palm rarely blossoms, which is especially true if the plant was cultivated outside of tropical areas.

Pronunciation

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Idiom

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鐵樹開花

  1. extremely rare or hard to succeed