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The most important thing in mathematics is to understand the concepts, not just to memorize formulas.
A writer must be willing to be challenged.
解释:称赞人不夸大他好的地方,那么听的人心里不痛快;诽谤人不增加他的过错,那么听的人心里不满足。
Writing is about paying attention to the things most people overlook.