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.
Learn the next connected idiom: 有朝一日 (yǒu zhāo yī rì) → 日新月异 (rì xīn yuè yì)
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