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不得而知
bùdéérzhī
1. unknown
2. unable to find out

Character Breakdown

不
bù
no, not, un-; negative prefix
HSK 1 4 丶
得
dé
to obtain, to get, to acquire; suitable, proper; ready
HSK 2 11 丶
而
ér
and, and then, and yet; but
HSK 3 6 丶
知
zhī
to know, to perceive, to comprehend
HSK 2 8 丶

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