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钢铁的未来在于回收和减少碳排放。
The future of steel lies in recycling and reducing carbon emissions.
Every person must have a thought that changes them, or a book, or a word, or a moment; and if they don't, their life is wasted.
对称性不仅是自然的一种属性,而且是寻找物理定律的指导原则。