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数学不知道种族或地理边界;对于数学来说,文化世界是一个国家。
What's terrible is to pretend that second-rate is first-rate. To pretend that you don't need love when you do; or you like your work when you know quite well you're capable of better.
战略的本质在于活动——选择以不同的方式执行活动或执行与竞争对手不同的活动。