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了解你是否能信任某人的最好方法就是去信任他们。
永远不要低估微小改进的力量——它们会随着时间累积。
We teach a subject not to produce little living libraries on that subject, but rather to get a student to think mathematically for himself.
We don't inherit the earth from our ancestors; we borrow it from our children. Let's return it better.