“Siderian Period”的概念、定义、翻译、参考文献-科学参考

单词	Siderian Period
释义	Siderian Period Encyclopedia 理学成铁纪释 Siderian Period成铁纪距今25亿～23亿年的地质时期。是元古宙的第一个纪，也是人类有纪录的最早的一个纪。
随便看	complete regular product complete regular ring complete Reinhardt domain complete relation complete residue system complete resolution complete resolution for finite groups complete revelation complete revolution complete Riemannian manifold complete Riemannian metric complete Riemannian space complete ring complete ring of fractions complete ring of quotients complete scheme complete semigroup complete semi-lattice complete sequence complete series complete set complete set equipment of bamboo weaving mat complete set of cases complete set of commuting observables complete set of commuting operators

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。