“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	sampling rate sampling rate sampling rate sampling rate sampling ratio sampling ratio sampling reliability sampling reliability sampling risk sampling scheme sampling speed sampling statistic sampling structure sampling survey sampling survey sampling survey sampling survey sampling survey method sampling system sampling system sampling system sampling technique sampling test sampling test sampling theorem

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