“环状星云”的概念、定义、翻译、参考文献-科学参考

单词	环状星云
释义	环状星云 Encyclopedia 理学行星状星云释 Ring Nebula环状星云位于天琴座的典型的行星状星云。星表中的编号为M57和NGC6720。位于北天区，距离地球2300光年，目视星等8.8，半径约1.3光年。由于面向地球呈环状结构，并处于明亮的织女星以南，长期以来备受关注。 Astronomy annular nebula; ring nebula环状星云
随便看	direct solar radiation direct solution of geodetic problem direct sound direct spectrum direct sports population direct stationary direct steaming machine for cocoon direct subgroup direct subsidies to grain farmers direct subsidy for grain production direct succession direct successor direct sum direct sum decomposition direct sum group direct summand direct sum module direct sum of groups direct sum of ideals direct sum of modules direct sum of objects direct sum of representations direct sum of rings direct sum of sets direct sum of sheaves

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。