英语语法分析

L Reflection nebulae have no light of their own.

l还有一种星云叫反射星云，它们本身并不发光。

Nowadays, many nebulae are known to be galaxies instead.

我们现在已经熟知的许多星系过去也被称为星云。

These nebulae can be seen with binoculars from a dark location.

你可以在较暗的地区用双筒望远镜看到这两个星云。