英语语法分析

Seyfert galaxies are energetic because they have a central black hole surrounded by a ring of gas.

赛非星系能量巨大，因为在其中心有-一黑洞，黑洞周围则环绕着环状星云。

In this paper, the distribution of four subclasses of four subclasses of Seyfert Galaxy Seyfert 1s, Seyfert 1.

文章比较了四种赛弗特星系子类1型赛弗特星系，1。

At the center of the starburst rings is the Seyfert nucleus, the believed signature of a supermassive black hole that is accreting surrounding gas and dust.

人们相信，在赛费特星系的中心，存在黑洞，依据就是环绕着星系的气体和灰尘。