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to re-think; to think back upon; to change one's mind
あの時の決断を思い返している。
I'm thinking back on the decision I made at that time.
彼女の言葉を思い返して反省した。
I thought back on her words and reflected.
旅先での出会いを思い返すと、心が温かくなる。
When I think back on the encounters during my travels, my heart feels warm.