“three age system”概念、定义、翻译-科学时代

单词	three age system
释义	人类学词汇手册 three age system （石铜铁）三时代划分制
随便看	population inertia population in quasi-household population inversion populationist populationist viewpoint population-land ratio population law population limitation population loss population map population map population mathematics population mean population mean population mean population migration population migration population model population model population modeling population momentum population mortality table population movement population of agricultural villages population of city districts

科学时代收录了1160609条科普词条，基本涵盖了常见科普常识及英语词汇的翻译，是科学学习和研究的有利工具。

three age system