“Premodern Communication Technology”的概念、定义、翻译、参考文献-科学参考

单词	Premodern Communication Technology
释义	Premodern Communication Technology Encyclopedia 理学〔发明创造〕释 Premodern Communication Technology古代通讯人类社会发展古代时期的通讯技术方法。
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科学参考收录了854744条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。