extragalactic的翻译，读音

例句

extragalactic nebula is invisible to the naked eye. 我们用肉眼是看不到河外星系的. 。

A number of supernovae and one nova in extragalactic systems. 河外星系中发现了一批超新星和一个新星； 。

This Paper has Studied the observational parameters of 20 extragalactic H 2 O megamaser Sources. 研究了至今为止已发现的20个河外H2O超脉泽源的观测参数. 。

To study the star formation properties of galaxies is one of the major tasks of extragalactic astronomy. 星系的恒星形成性质的研究是目前河外天体物理学的热门研究领域。

In this paper, we investigate the relation between the redshift distribution and the luminosity function of extragalactic objects. 在本文中，我们研究河外天体的红移分布和它们的光度函数之间的关系。