Definition
Used to describe the ability to distinguish between two very similar people or things.
用於分辨兩個非常相似的人或事物。
The two paintings are so similar, I really can't tell which is which.
這兩幅畫太相似了，我真的分不出來哪個是哪個。
The twins look so alike that even their parents often have trouble telling which is which.
這對雙胞胎長得太像了，甚至他們的父母也常常分不清誰是誰。
With so many similar documents in the filing cabinet, I don't know which is which.
文件櫃裡有這麼多相似的文件，我不知道哪個是哪個。