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being enthusiastic about; being wild about; being absorbed in; being engrossed in; being devoted to
彼はゲームに熱中しすぎている。
He is too absorbed in games.
読書に熱中して時間を忘れた。
I was so absorbed in reading that I forgot the time.
仕事に熱中するあまり体を壊した。
I ruined my health because I was too absorbed in work.