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in the text I have "biale kruki" so I do not think it would be appropriate to translate it as 'rarity, sth unique'cause it won't reflect the exact Polish phrase; I am sure that there is such a phrase in English but i do not remember it and need it uregently
The asker has declined this answer Comment: 'white raven' does not mean a rare thing
14 mins confidence:
Explanation: sth exteremely rare, a rarity
world, as well as a few of my own personal rants. The online version
of the inimitable White Crow, a quarterly print publication
The white crow is a "scientific joke". ... Master: "True, however, we can DISPROVE the
theory that all crows are black by observating even a single white crow!".