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不得而知
bù dé ér zhī
HSK 7
desconhecido; impossível descobrir
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不
no, not, un-; negative prefix
radical 一componentes ⿱一？
得
to obtain, to get, to acquire; suitable, proper; ready
radical 彳componentes ⿰彳⿱旦寸
而
and, and then, and yet; but
radical 而
知
to know, to perceive, to comprehend
radical 矢componentes ⿰矢口