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冬天,温度很低,高空云层里的温度就更低了,云中的水汽直接凝(ning)结成了小冰晶、小雪花。这些小冰晶、小雪花增
In winter, the temperature is very low, the temperature in the high-altitude clouds is even lower, and the water vapor in the clouds directly condenses into small ice crystals and small snowflakes. These small ice crystals, small snowflakes increase