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Open the tool →不得而知 (bù dé ér zhī) is a Chinese idiom (chengyu) meaning “it is impossible to find out”.
不得而知 is pronounced bù dé ér zhī in Mandarin Chinese.
Literally, 不得而知 means “cannot obtain knowledge”. It is used to mean “it is impossible to find out”.
得:能够。没有办法知道。