“north American nebula”的概念、定义、翻译、参考文献-科学参考

单词	north American nebula
释义	north American nebula Encyclopedia 理学发射星云释 north American nebula北美星云位于天鹅座尾部的发射星云。《星云星团新总表》中的编号为NGC7000，因其形似北美洲大陆而得名。
随便看	population characteristic population classification population colonization population comparison population control population correlation coefficient population covariance population crash population crisis population demography population density population density of pest Population Development population deviation population dispersal population distribution population distribution laws population distribution of cancer population diversity population doubling time population dynamics population dynamics of marine organisms population dynamics of rodents population ecological restoration population ecology

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。