The company's technology has since learned to tell apart near-identical products.

Why are the benighted coins so difficult to tell apart?

Without their distinctive dress, they were hard to tell apart.

The heat and the nervousness were hard to tell apart.

I whispered, for whispering voices are hard to tell apart:

They were hard to tell apart; their emotional tone seemed always low, their talk trivial.

Because these days they're awfully hard to tell apart.

Small koi are easy to tell apart from goldfish.

Ilse Koch I was always able to tell apart.

They were even harder to tell apart as wolves.

The Empidonax flycatchers are very hard to tell apart.

They're so hard to tell apart in the dark.

The brand representatives were able to tell apart the real from the fake with great ease.

The two were too intertwined to tell apart.

Both men play almost identical styles, and at a distance are very hard to tell apart.

Hence, they are "average faces" that are hard for recognition systems to tell apart.