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Open the tool →知一而不知二 (zhī yī ér bù zhī èr) is a Chinese idiom (chengyu) meaning “to know one thing but not the other”.
知一而不知二 is pronounced zhī yī ér bù zhī èr in Mandarin Chinese.
Literally, 知一而不知二 means “Know one but not two”. It is used to mean “to know one thing but not the other”.
知道一是什么,却不知道二是怎么回事。形容了解事物不够全面。