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Why Do Some Clouds Produce Rain While Others Do Not?
为什么有些云会下雨，有些却不会？
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Clouds form when water vapor cools and turns into tiny droplets.云是水蒸气遇冷凝结成微小水滴而形成的。
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Rain falls only when droplets grow heavy enough to fall to the ground.只有当水滴变得足够重时，才会以雨的形式降落到地面。
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Warm air holds more moisture than cold air does.暖空气比冷空气能容纳更多水汽。
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Strong updrafts keep small droplets floating high in the sky.强烈的上升气流使小水滴悬浮在高空。
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When droplets collide and merge, they become larger and heavier.水滴相互碰撞合并后，会变得更大更重。
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Low, thick clouds like nimbostratus often bring steady rain.低而厚的雨层云常带来持续性降雨。
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High, thin cirrus clouds usually contain ice crystals and no rain.高而薄的卷云通常由冰晶组成，不会降雨。
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The type of cloud tells us if rain is likely soon.云的类型可预示近期是否可能下雨。