“Helix Nebula”的概念、定义、翻译、参考文献-科学参考

单词	Helix Nebula
释义	Helix Nebula Encyclopedia 理学行星状星云释 Helix Nebula螺旋星云位于宝瓶座，标准历元J2000的赤经22h29m38.54s，赤纬-20°50′13.64″的行星状星云。《星云星团新总表》中的编号为NGC7293，是离地球最近最明亮的行星状星云。 Astronomy Helix Nebula螺旋星云
随便看	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 lower transit

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。