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The progress of mathematics is measured by the number of problems it can solve.
创新不仅仅是技术的问题;它关乎我们思维和运作方式的改变。
Sometimes we get sad about things and we don’t like to tell other people that we are sad about them. We like to keep it a secret. Or sometimes, we are sad but we really don’t know why we are sad, so we say we aren’t sad but we really are.