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those; they
「彼等」 has another reading with different meanings.
they; them
あれらの箱ばこは全部ぜんぶ捨てすてていい。
You can throw away all those boxes.
あれらの建物たてものは古いふるいものだ。
Those buildings are old.
あれらを整理せいりするのに一日ついたちかかった。
It took a day to organize those.