“Free and Imperial Cities”的概念、定义、翻译、参考文献-科学参考

单词	Free and Imperial Cities
释义	Free and Imperial Cities Encyclopedia 历史学德意志历史释 Free and Imperial Cities帝国自由市神圣罗马帝国时期直属于皇帝（亦即德意志国王）的城市和市镇，根源于皇帝领地。
随便看	tube falling objects fishing tube forming technology tube furnace pyrolyzer Tubegatan potash deposit，Uzbekistan tube hydroforming machine tube-in-tube structure tube inversion tubeless-siphon effect tubeless syphon tube model tube nucleus tube of flow tube of flux tube of force tube of magnetic lines of force tube of the vector field tube phenomenon tube photometer tube quenched and tempered heat treatment tuber tuberal nucleus tuberal part tuberal region tubercle tubercular corrosion

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。