1.【天】星云
2.【医】角膜翳
1.[Astronomy]a very large cloud of dust and gas that exists in outer space
2.[Medical & Healthcare]a faint cloudy area or scar on the cornea of the eye
1.Although some of these nebulas appear like planets on the sky (hence their name), they actually surround stars far outside our Solar System.
虽然这一类星云看起来象是天空中的行星（也因此而得名），实际上它们所环绕的恒星远在我们太阳系之外。
2.This spectacular image captures, in false color, the nebulas , bright ionization fronts, and fine details of the dark dust.
这张美轮美奂的伪彩色照片捕捉到了星云的倩影，位于前方的亮离子以及黑暗尘埃云的细节。
3.This spectacular image captures the nebulas , bright ionization fronts, and fine details of the dark dust.
这幅叹为观止的图片拍摄到了这些星云中的明亮电离区前缘，以及这片黑暗尘埃的细枝末节。
4.W5 is also known as IC 1848, and together with IC 1805 form a complex region of star formation popularly dubbed the Heart and Soul Nebulas .
W5也叫做IC1848，与IC1805一起构成了一个复杂的恒星形成区，也就是闻名遐迩的心与魂星云。
5.nebulas but without any luminosity sometimes reveal their presence as dark patches obscuring the light of stars beyond them.
某些与银河星云相似但不发光的天体，有时看来象块黑色补丁，遮住了周围的星光。
6.Astronomers have argued for years about how stars condense out of the diffuse clouds of dust and gas called nebulas.
由尘埃和气体构成的云团被称为星云。有关恒星如何从呈弥漫状态的星云凝缩而来，天文学家们争论了很多年。
7.Three nebulas contained inside the enormous Orion molecular cloud located 1, 500 light-years from Earth are shown in this mosaic WISE image.
这张“智慧”镶嵌图像展示的是距离地球1500光年，猎户座大分子云团内的三大星云。
8.Explanation: The Great Nebula in Orion, an immense, nearby star birth region, is probably the most famous of all astronomical nebulas .
说明：位于恒星形成区域附近的巨大星云--猎户座大星云可能是所有宇宙星云中最著名的一个。
9.Real time particle systems showing ship damage, torpedo impacts, nebulas and various other gorgeous effects will startle the senses!
实时粒子系统显示船舶损坏，鱼雷的影响，行星和其他各种绚丽效果惊人感觉！
10.The problem with both ideas is that the nebulas are so distant and wispy that they cannot be observed in sufficient detail.
两种观点的问题在于：星云遥远而模糊，无法对其进行特别详尽的观测。