improvement(改善): We’ve seen a significant improvement in his performance. (彼のパフォーマンスの大幅な改善が見られました) - 試験に出る! 英単語検索辞書

improvement(改善): We’ve seen a significant improvement in his performance. (彼のパフォーマンスの大幅な改善が見られました)

We’ve seen a significant improvement in his performance.