遇到冷空气水蒸气
Encounter cold air and steam
以上为机器翻译结果，长、整句建议使用 人工翻译 。
天气好的时候，白天与晚上的温差就会变大，遇到冷空气的水蒸气，就变为小水滴。
The difference in temperature of time of good weather, daytime and evening will become big, meeting the steam of cold air, change into small drop of water.
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