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姗姗来迟的大雪,降落需要几步?
富含水蒸气的空气上升到高处,那里温度很低,水蒸气在空气中的灰尘、污染物、火山灰、海盐等固体小颗粒上,凝结成液滴,称为云滴(Cloud Droplet),云滴内部的小颗粒称为云凝结核(cloud condensation nuclei, CCN)。
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今日热点
Trans troops ban blocked
Return to Earth
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Earthquake shakes Bay Area
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JFK files released
US housing starts rebound
Worker stole $1.6 million
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Reinstating fired workers
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Delta plane wing hits runway
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Lebanon-Syria ceasefire
To open headquarters in TX
Retires after 15 seasons
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