科学素养与生活应用·英语30篇（3）
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Why Dew Forms on Grass in Early Morning
为什么清晨草叶上会凝结露水
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Dew forms when warm air touches cold grass at night.夜间暖空气接触冷草叶时形成露水。
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Water vapor in air cools and changes into tiny liquid drops.空气中的水蒸气遇冷凝结成微小水滴。
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Grass loses heat faster than air, so its surface gets colder.草叶散热比空气快，表面因而更冷。
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This cooling makes moisture condense just like on a cold drink.这种降温使水分凝结，就像冷饮杯外壁结露一样。
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Dew appears most on clear, calm nights with high humidity.晴朗、无风且湿度高的夜晚露水最多。
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It vanishes when sun warms the grass again in morning.清晨阳光回暖，露水随之消失。
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Dew gives plants small water before rain starts.降雨前，露水为植物提供少量水分。
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Farmers watch dew to guess if crops need less irrigation.农民通过观察露水判断作物是否需减少灌溉。