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Machinery and labor-saving devices are only valuable as they serve to reduce the cost of manufacture.
儿童有一种特殊的敏感性,集中体现他去吸收周围的一切。
"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."
在转型期间,石油和天然气行业在全球能源结构中发挥着关键作用。