The twins are so alike that I can't tell one from the other.

那对双胞胎太像了以致我不能把他们区分开。

youdao

The twin brothers are so alike that I cannot tell one from the other.

这对孪生兄弟长得像极了，我无法分辨。

youdao

The twins are so much alike that it's impossible to tell one from the other.

这对双胞胎非常相像，几乎不可能把他们分辨出来。

youdao

Well, how can you tell the one from the other?

那么你怎么把它们分开呢？

耶鲁公开课 - 文学理论导论课程节选

This effectively dulled their sense of smell: the rats could not tell one smell from the other, even for a reward.

BBC: Sense of smell 'can be improved through training'

And while there is many a newspaper or magazine editor who dreams of unearthing that freelance gem he truly believes is out there, most of the young (and not so young) hopefuls that phone constantly and fill his inbox cannot tell one end of a story from the other.

ECONOMIST: A journalistic problem solved?

And because there is no way to tell a Klamath-spawned salmon from one from any other river once the fish reach the ocean, the fishery council says it has no choice but to restrict all salmon fishing along 700 miles of coast.

ECONOMIST: Saving the fish of the Klamath river