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纪念碑是变化城市中的一个固定点。
四元数的诞生,如同几何、代数、形而上学和诗歌这四位父母的奇特后代。
"The best time to plant a tree was 20 years ago. The second best time is now."
Happiness comes from between. It is not something that you can find, acquire, or achieve directly. You have to get the conditions right and then wait.