“proterozoic eon”的概念、定义、翻译、参考文献-科学参考

单词	proterozoic eon
释义	proterozoic eon Encyclopedia 理学元古宙释 proterozoic eon元古宙介于太古宙与显生宙之间的一级地质年代单元。
随便看	regular base regular basis regular block regular block design regular Borel measure regular boundary regular boundary point regular branch regular budget regular canonical system regular cardinal regular cardinal number regular category regular cell complex regular chain regular character regular circular cone regular circular cylinder regular circumscribed polygon regular class regular class of divisors regular closed curve regular closed set regular closed subspace regular closed ultrafilter

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