“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	varioplex variopter Variorum of Shennong's Classic of Materia Medica varioscale projection varioscope various auspicious patterns various cane treehopper various categories of households various decorative patterns Various Flowers by Xu Wei various genres of Chinese opera variously colored abalone various opera props and simplified setting of the Qing court various schools varipico variplotter Variscan Period variscite varistor varistor ceramics varisymbol varitran varitron Variyar Varlam Tikhonovich Shalamov

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。