念念不忘 Never forget
Explanation
时刻思念着，形容牢记于心，时刻不忘。
Always thinking of something; describes something that is always remembered
Origin Story
王昭君，汉元帝时宫廷的一位美人，因不愿受宠而远嫁塞外，她对故土的思念，如黄河般绵绵不断，用她柔弱的肩膀扛起了汉匈两国的和平。虽身处异国他乡，但她心中始终念念不忘汉朝的亲人、故土，她期盼着有一天能回到故土，和亲人团聚。她曾多次写信给汉朝的亲人，诉说她对家乡的思念。在她死后，人们为了纪念她，在她的墓前立了一块碑，上刻着“昭君出塞”四个字。
Wang Zhaojun, a beautiful woman in the imperial court during the reign of Emperor Yuan of the Han Dynasty, reluctantly married a man far away in the north, leaving her homeland behind. Her longing for home was as endless as the Yellow River, and she bore the weight of peace between the Han and Xiongnu peoples on her fragile shoulders. Even in a foreign land, she always remembered her relatives and homeland in the Han Dynasty. She longed to return home one day and reunite with her family. She frequently wrote letters to her family in the Han Dynasty, expressing her yearning for home. After her death, people erected a tombstone in her memory, inscribed with the four characters "Zhaojun goes to the north".
Usage
用于形容对某人或某事非常想念，无法忘记。
Used to describe a strong yearning for someone or something that one cannot forget.
Examples
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他一直念念不忘家乡的山水。
ta yizhi niannianbuwang jiaxiang de shanshui
He always remembers the landscape of his hometown.
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这件事，我一直念念不忘。
zhe jianshi, wo yizhi niannianbuwang
I will never forget this matter.