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The only way to learn mathematics is to do mathematics.
世界上充满了显而易见的事物,但没有人注意到它们。
I earnestly wish to point out in what true dignity and human happiness consists.
The beauty of physics lies in its ability to explain the complex with simple principles.
解释:国家大而政绩小,国家的影响就跟它的政绩一样;国家小而政绩大,国家的地位也大。