It must be one or the other.
二者必居其一 UNE CHANCE SUR DENX ; Half a Chance ; either one or the other
门不关就得开，二者必居其一。
A door must be either shut or open.
youdao
对古希腊的哲学家来说，两者必居其一是明显的。
These alternatives were clear to the philosophers of ancient Greece.
他的“矛盾”思想则是非此即彼、非彼即此，二者必居其一。
His spear and shield thought is not this but that, or not that but this, must select either of the two.
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