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の区別が

the distinction between

→ の
phrase Uncommon #11,997
the distinction between Usually followed by できる or つく to say someone can distinguish things, or ない to say there is no distinction.
JA: 色の区別がつきません。
EN: I can't tell the colors apart.

ビルと彼の兄さんの区別が全然できない。

I can't tell Bill and his older brother apart at all.

舞台と現実男と女の区別がつかないんです

I can’t tell the difference between the stage and reality, or between men and women.

— さらば、わが愛／覇王別姫 (1993)

彼は善と悪の区別がわからない。

He can't tell the difference between right and wrong.

羊と山羊の区別がわかりますか。

Can you tell the difference between sheep and goats?

その双子はあまりによく似ているので私は両者の区別が出来ない。

The twins look so much alike that I can't tell them apart.

彼には私と彼のお兄さんの区別がつきません。

He can't tell me and his older brother apart.

鳩は訓練さえすれば、ピカソとモネの絵画の区別ができる。

With training, pigeons can even tell the difference between paintings by Picasso and Monet.