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that; those; the
「彼の」 has another reading with different meanings.
あの人は私の先生です。
That person is my teacher.
あの日のことは今でも覚えている。
I still remember that day.
あの店のラーメンは一度食べたら忘れられない。
The ramen at that shop is unforgettable once you try it.