"know which is which" in Chinese (Simplified)

• 分辨哪一个是哪一个

Definition

能够分辨两个人或物体中的哪一个是哪一个；知道它们之间的区别。

Usage Notes (Chinese (Simplified))

经常用于两个极为相似、容易混淆的事物或人（如双胞胎、钥匙、瓶子）。常出现在“无法/能否分辨哪一个是哪一个”的句子里。通常只用于两者之间。

Examples

These apples look so similar, I can't know which is which.

这些苹果太像了，我无法**分辨哪一个是哪一个**。

The twins dress alike, so it's hard to know which is which.

这对双胞胎穿得一模一样，很难**分辨哪一个是哪一个**。

If you mix up the bottles, you won't know which is which.

如果把瓶子弄混了，你就无法**分辨哪一个是哪一个**。

After labeling the keys, now I finally know which is which.

贴上标签后，我终于**分得清哪一个是哪一个**了。

Honestly, with those new uniforms, I can't know which is which anymore.

说真的，穿上新制服后，我再也**分不清哪一个是哪一个**了。

There were so many bags at the airport, it was impossible to know which is which without tags.

机场有这么多行李箱，没有标签根本**分辨不了哪一个是哪一个**。