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。
You can see nebulae in the clear summer sky.
在晴朗的夏夜可以看到天上的星云。
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。
The dark nebulae stand out because they block out background stars.
黑暗星云之所以显著，是因为它们屏蔽了背景恒星的光芒。
Light is unable to escape through a number of dark nebulae which are present there.
光线是无法逃出那里存在的大量暗色星云的。
Light is unable to escape through a number of dark nebulae which are present there.
光线是无法逃出那里存在的大量暗色星云的。
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