Comets consist of "dirty ice", rather than solid rock, and so contain little iridium.
彗星是由“脏冰”所组成，而不是像小型那样由固体岩石组成，所以只含有少量的铱。
Ganymede, the largest moon in the solar system, has a dirty ice surface cut by fractures and peppered by impact craters.
这颗太阳系中最大的卫星，表面冰盖布满断层的切口和火山灰的粉末。
Since plants had not yet evolved 700 million years ago, the dirty ice could have been the only dark spots on Earth's surface to absorb the sun's rays.
7亿年前地球上还没有植物，浑浊的冰（泥土和冰的混合物）可能是地球表面唯一能够吸收阳光的黑色物质。
The ground is covered with moraine. Ice under it is gray and dirty.
地表覆盖着冰碛石。底部的冰呈灰色并且肮脏。
Comets are often known as dirty snowballs, and consist mainly of ice and rock.
彗星一般被认为是一些脏雪球，主要由冰和岩石构成。
Such "dirty thunderstorms" may occur when rock and ice particles loosed by exploding magma collide in the atmosphere.
火山爆炸的岩浆使得那里的岩石松动和形成了冰粒子，当它们在大气中相互碰撞时，就有可能出现像图片上的那种“肮脏雷雨”。
Now it can be recognized by dirty yellow ice.
现在，却只能看到脏兮兮的黄色冰层。
Now, it can be recognized by dirty yellow ice.
现在，却只能看到脏兮兮的黄色冰层。
It is at this time, out the window, that rays of light begin screaming off dirty chunks of ice, as if looking for a way to leave.
这时，窗外的光线开始在一小块脏冰上呼喊，像寻找离开的方式。
In summer, the stream from the gully flows into the Baikal. Now, it can be recognized by dirty yellow ice.
夏天，溪水从山谷流进贝尔加湖。现在，却只能看到脏兮兮的黄色冰层。
The ice gets pretty dirty and it's the guano stains that we can see, " he added."
他还说：「冰面会变得很脏，那就是我们看到的鸟粪。
The ice gets pretty dirty and it's the guano stains that we can see, " he added."
他还说：「冰面会变得很脏，那就是我们看到的鸟粪。
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