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数学不仅仅是关于数字、方程、计算或算法:它是关于理解的。
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
The past, like the future, is indefinite and exists only as a spectrum of possibilities.
如果一件事太难,我们就换别的。还有比这更简单的吗?