“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	lower semicontinuous lower semicontinuous decomposition lower semicontinuous equivalence lower semicontinuous function lower semi continuous hull lower semi-continuous hull lower semicontinuous hull lower semicontinuous mapping lower semicontinuous partition lower semicontinuous regularization lower semi-lattice lower semi-modular lattice lower semi strictly diagonally dominant matrix lower semi-strictly diagonally dominant matrix lower separation axiom lower series lower set lower singular exponent lower solution lower solution; subsolution lower strong derivative lower subsemilattice lower sum lower surface lower topological limit

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。