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successively; one after another
お客さんが続々と店に入ってきた。
Customers came into the store one after another.
人気シリーズの新製品が続々と発売されている。
New products are being released one after another.
新しい証拠が続々と見つかり捜査が進んだ。
New evidence was found one after another, advancing the investigation.