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我们今天种下的每一粒种子都是对后代的承诺。
A good novel tells us the truth about its characters; a great novel tells us the truth about ourselves.
伟大的小说是让我们用新的眼光看世界的小说。
The greatest gift is the gift of life itself.
To do mathematics is to engage in an act of discovery and conjecture, intuition and inspiration.
行为主义者放在自己面前的规则或衡量标准总是:我能否用"刺激和反应"来描述我所看到的这一行为?