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不知凡几
不知凡幾
bùzhīfánjǐ
1. one can't tell how many
2. numerous similar cases

Character Breakdown

不
bù
no, not, un-; negative prefix
HSK 1 4 丶
知
zhī
to know, to perceive, to comprehend
HSK 2 8 丶
凡
fán
any, every, all; common, ordinary
HSK 6 3 丶
几
jǐ
small table; how many; a few, some
HSK 1 2 丶

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