十万个为什么·科学阅读30篇（6）
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How Do Raindrops Form Inside Clouds?
雨滴是怎样在云中形成的？
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Clouds hold tiny water droplets and ice crystals.云中悬浮着微小的水滴和冰晶。
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Water vapor rises and cools high in the sky.水蒸气上升至高空后冷却。
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It condenses around dust or salt particles in air.它在空气中的尘埃或盐粒周围凝结。
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Droplets slowly grow by bumping into each other.水滴通过相互碰撞缓慢变大。
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When heavy enough, they fall as raindrops.当足够重时，便以雨滴形式落下。
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Large drops may break apart while falling.较大的雨滴下落时可能碎裂。
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Raindrops are not tear-shaped—they are round or flat.雨滴并非泪滴状，而是呈圆形或扁平状。
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The size depends on how long they stay in the cloud.雨滴大小取决于其在云中停留的时间。