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The paper discussed orientation workspace of 3 UPU parallel manipulators with pure spherical motion and symmetric geometry.
详细讨论了纯转动型3-UPU并联机构的工作空间.
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The establishing of UPU plays an active role in promoting the postal communication among countries.
摘要万国邮联的成立对促进各国间的邮政通讯联系起了积极作用.
= Universal Postal Union,国际邮政联盟???
英汉翻译词典包含4367426条英汉汉英翻译词条，基本涵盖了全部常用英语单词及常用语的翻译及用法，是英语学习的有利工具。