With progress made in modern biology and material science, many previous formidable difficulties in clean technology can now be solved.
现代生物和材料科学技术的进步，使今天的制革清洁技术能够解决过去不能解决的问题。
Engineers have contributed enormously to the progress of human society in material wealth. Engineering science and technology is the method by engineers to promote social and economic development.
工程师为人类物质文明的进步做出了巨大的贡献，工程科技是工程师推动社会经济进步的手段。
Engineers have contributed enormously to the progress of human society in material wealth. Engineering science and technology is the method by engineers to promote social and economic development.
工程师为人类物质文明的进步做出了巨大的贡献，工程科技是工程师推动社会经济进步的手段。
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