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English definition of “which is which”

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which is which

used in expressions that relate to being able to see the difference between two very similar things or people: For the first few months the babies looked so alike I couldn't tell which was which.
Translations of “which is which”
in Chinese (Traditional) 哪個是哪個(用於區分兩個相似的人或物時)…
in Chinese (Simplified) 哪个是哪个(用于区分两个相似的人或物时)…
(Definition of which is which from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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