- 二者必居其一 èrzhěbìjūqíyī either one or the othermust be one of the two; either one or the other
- 只知其一，不知其二 zhǐzhīqíyībùzhīqí'èr to know the first, but not the secondTo know only one side of something without knowing the other; describes having an incomplete understanding of a situation or seeing a problem from a one-sided perspective
- 知其一，不知其二 zhīqíyībùzhīqí'èr to know only one aspectto have an incomplete or superficial understanding of something; to know only part of the story
- 知其一不达其二 zhīqíyībùdáqí'èr to know only one aspectto have an incomplete or superficial understanding of a matter; to know part of something without understanding the whole
- 知其一未睹其二 zhīqíyīwèidǔqí'èr partial understandingto know only one aspect of something; to see one side of a matter but not the other
