要多勇敢才可以念念不忘
[yào duō yŏng găn cái kĕ yĭ niàn niàn bù wàng]
It means, 'How brave must one be to never forget.' This expresses admiration and respect for a strong, unwavering emotional commitment and perseverance. One must have a lot of courage or strength not to give up on memories that are deeply cherished, even in face of obstacles.