对主要由冰和尘埃构成的彗星核心部分（彗核）的描述词。
时不时地，这些“脏雪球”会像行星一样绕着太阳公转。
Now and then these "dirty snow balls" begin to orbit the sun just as the planets do.
这些“脏雪球”在冒险接近太阳时会丢出气体和尘埃。
These "dirty snowballs" castoff gas and dust whenever they venture near the sun.
彗星一般被认为是一些脏雪球，主要由冰和岩石构成。
Comets are often known as dirty snowballs, and consist mainly of ice and rock.
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