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those; they
「彼ら」 has another reading with different meanings.
they; them
あれらの本ほんは全部ぜんぶ読みよみました。
I read all of those books.
あれらは古いふるい道具どうぐですね。
Those are old tools, aren't they?
あれらを片付けかたづけておいてね。
Please put those things away.