When I saw your photos, I realized that nothing has changed. You're still the person I fell in deep love.

我看到你的照片，我想没有什么可改变的，你仍然是我深爱的人。

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K. Marx had deep love for mathematics. For decades, he persisted in studying mathematics at leisure, taking nearly one thousand pages of mathematical notes, which still remained.

马克思热爱数学，几十年坚持不渝地利用闲暇时间学习数学，留下了近千页的数学手稿。

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