Finally, a possible evolutionary sequence of Seyfert Galaxies, from Seyfert is to Seyfert 2s then to Seyfert 3s or liners, are suggested.

• 最后提出了赛弗特星系可能的一种演化序列：从1型赛弗特星系演化到2型赛弗特星系，最后演化为3型赛弗特星系或低电离核星系。