“周期--时期--〈地〉纪”概念、定义、翻译-科学时代

单词	周期--时期--〈地〉纪
释义	水利水电词汇手册 period 时期；周期；〈地〉纪
随便看	conversation piece conversation piece conversation piece conversation poem converse converse digraph converse domain converse effect converse judgement converse law converse law of double negation converse-negative proposition converse probability formula converse proposition converse statement converse terms converse theorem converse theorem converse twist conversion conversion conversion conversion conversion conversion

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。

period