科学素养与生活应用·英语30篇（3）
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Why Some Clouds Look Gray Before Rain
为什么下雨前云朵看起来是灰色的
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Clouds turn gray when they become very thick and dense.云层变得非常厚密时会变灰。
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Thick clouds block most sunlight from passing through them.厚云会阻挡大部分阳光透过。
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Less light reaches our eyes, so the cloud appears darker.到达我们眼睛的光线减少，因此云看起来更暗。
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Water droplets inside grow larger as rain approaches soon.临近降雨时，云内水滴会逐渐变大。
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Gray color often means heavy moisture and possible rainfall.灰色通常意味着湿度高，可能即将降雨。
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Scientists measure cloud thickness to forecast storm timing accurately.科学家通过测量云层厚度来准确预测风暴发生时间。
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This natural signal helps people prepare for wet weather.这种自然信号有助于人们为阴雨天气做好准备。
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Light scattering changes as droplet size increases inside clouds.云内水滴增大时，光的散射也会发生变化。