asteroidal的翻译，读音

例句

Because at least one asteroid appears to be coated by a thin layer of ice. And just that kind of asteroidal frosting could have been the source of our water here on Earth. 现在，《自然》杂志发表的两项研究告诉我们这一观念恐怕是大错特错的，因为我们至少已发现了一颗小行星表面覆盖着一层薄冰，而且只有这种小行星结霜有可能是地球上水的来源。