This fairly common sight occurs when high thin clouds containing millions of tiny ice crystals cover much of the sky. Each ice crystal ACTS like a miniature lens.
这种相当常见的气象景象之所以会出现，是因为覆盖广大天空的高层薄云中含有数以百万计的小冰晶，而每一个冰晶的作用就像是小型的棱镜。
Water molecules join together in a rigid pattern - a tiny ice structure that's the heart of a snow crystal.
水分子连接成坚固的结构排布，这一小小的冰结构是雪花晶体的核心。
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