tell [sth/sb] apartvtr phrasal sepphrasal verb, transitive, separable: Verb with adverb(s) or preposition(s), having special meaning, divisible--for example, "call off" [=cancel], "call the game off," "call off the game."
informal (distinguish between)
分辨 fēn biàn
区分 qū fēn
The twins are so alike that it's not easy to tell them apart.