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For in the final analysis, our most basic common link is that we all inhabit this small planet. We all breathe the same air. We all cherish our children's futures. And we are all mortal.
You smiled and talked to me of nothing and I felt that for this I had been waiting long.
数学是一门活生生的学科,随着新的思想和发现不断演变。
记忆是个狡猾的东西;它既可以是祝福,也可以是诅咒。