Daily Chinese Idiom Guessing Game
One day in the future; someday.
将来有那么一天。
元·无名氏《博望烧屯》第一折有朝一日，我出矛庐指点世人迷，凭着我剑挥星斗，我志逐风雷。”
She keeps studying hard, believing that one day she will succeed.