鲜为人知

xian3 wei2 ren2 zhi1

rarely known to anyone (idiom); almost unknown, secret to all but a few

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鲜为人知

xiǎn wéi rén zhī

rarely known by people

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鮮為人知|鲜为人知 [xiǎn wéi rén zhī] ► rarely known to anyone (idiom); almost unknown ► secret to all but a few