To remember something persistently and never forget it.
念念时刻思念着。形容牢记于心，时刻不忘。
《朱子全书·论语》言其于忠信笃敬，念念不忘。”
She still thinks about her childhood friend every day; it's a case of missing someone so deeply that she can never forget.
Learn the next connected idiom: 念念不忘 (niàn niàn bù wàng) → 忘乎所以 (wàng hū suǒ yǐ)
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