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。
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。
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。
Now, it can be recognized by dirty yellow ice.
现在，却只能看到脏兮兮的黄色冰层。
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