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each (person); individually; one by one; one at a time; in turn
1人1人の名前を呼んで返事を確認した。
I called each person's name and confirmed their response.
1人1人に丁寧に説明した。
I explained carefully to each individual.
先生が1人1人にアドバイスをくれた。
The teacher gave advice to each person.