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数学不是一项观赏性运动;要理解它,必须积极参与其中。
Mathematics is not a spectator sport; to understand it, one must engage with it actively.
The war on coal is a war on the American worker.
The more you know about life, the more you can bring to your work.
伟大的品牌不追逐趋势,而是创造趋势。