以下为句子列表：
英文: He earns his living by working in a paper-making factory.
中文: 3他们通过在造纸厂工作来养活自己。
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英文: It is common knowledge that the Chinese invented paper-making and gunpowder.
中文: 中国人发明了造纸术和火药，这不过是常识罢了。
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英文: Develop bamboo pulp, bamboo related products and paper package printing, increase production of high and medium class papers and paper-related products, foster new type of paper-making leading enterprises, so as to set up modern environmental bamboo pulpi
中文: 发展竹浆、竹制品制造和纸制包装印刷，增加高中档纸及纸制品生产，培育新型造纸龙头企业，形成有四川特色的现代环保型规模化竹材制浆企业集群。
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英文: He made great contribution to humankind for his invention of paper-making technique.
中文: 蔡伦对人类最大的贡献足发明了纤维纸及其造纸术。
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英文: By using secondary fibers, fiber raw material can be saved and the environment pollution caused by paper-making industry can be relieved, but there are still many unsolved problems in the recycle process.
中文: 摘要二次纤维的开发利用可以节约纤维原料，减轻造纸工业对环境的污染，但是在其回用过程中仍然存在很多期待解决的问题。
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