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In science, we try to explain what we don't understand. In mathematics, we try to understand what we can't explain.
If you want to understand function, study structure.
我需要一杯酒,我需要很多人寿保险,我需要一个假期,我需要一个乡下的家。我有的是一件外套,一顶帽子和一把枪。
成功属于那些努力工作的人。