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alternately; by turns
社員が代わる代わるマイクの前に立ってスピーチした。
Employees took turns standing at the microphone to give speeches.
患者の家族が代わる代わる病室を訪れた。
The patient's family members visited the hospital room in turns.
子どもたちが代わる代わるブランコに乗って遊んだ。
The children played on the swing, taking turns one after another.