冰的表面也比雪显黑。
The surface of the ice is also darker than snow.
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表面之下，冰或厚或薄。
Underneath the surface, the ice can be thick or thin.
霜是由冰的微晶组成，它生长在固体表面的外部。
Frost consists of tiny crystals of ice which grow outward from a solid surface.
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