These grow directly from condensing water vapor in the air, usually around a nucleus of dust or some other foreign material.
这些冰晶由空气中的水蒸气冷凝而来，通常被灰尘或其他外界物质所包围。
These grow directly from condensing water vapor in the air, usually around a nucleus of dust or some other foreign material.
这些冰晶由空气中的水蒸气冷凝而来，通常被灰尘或其他外界物质所包围。
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