“postal history”的概念、定义、翻译、参考文献-科学参考

单词	postal history
释义	postal history Encyclopedia 工学〔交通史〕释 postal history邮政史邮政发展的历史。邮政是依赖实物传输网进行书面通信和快速送达小件物品的系统。“邮”指通信方式和组织，“政”指由国家政权进行统治。数千年来，绝大多数邮政系统为政府运行。至今，邮政大力发展，已经具有通政通民通商的特征，也是国民经济运行不可或缺的行业。
随便看	convergent repeated series convergents convergent scheme *-convergent sequence convergent sequence convergent sequence of numbers convergent sequence of sets convergent series convergents of continued fraction convergent spectrum convergent subsequence convergent subsequence principle convergent synthesis convergent thinking convergent thinking method convergent thread convergent validity convergent wave convergent with probability one convergescence converging converging angle converging beam converging diffuser converging-diverging nozzle

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