十万个为什么·科学阅读30篇（5）
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Why Do Deserts Get So Cold at Night?
为什么沙漠夜晚会变得非常冷？
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Deserts heat up quickly in sunlight because sand holds little moisture.沙漠在阳光下升温很快，因为沙子含水量极少。
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At night, the dry air cannot trap heat well.夜间干燥的空气无法很好地保存热量。
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Heat escapes rapidly into space without clouds to block it.没有云层阻挡，热量迅速散逸到太空。
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Temperatures can drop over 30 degrees Celsius in one night.一夜间气温降幅可达30摄氏度以上。
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This big change is called a large diurnal temperature range.这种剧烈变化称为较大的昼夜温差。
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Plants and animals in deserts adapt to both hot and cold extremes.沙漠中的动植物适应了极端的高温和低温。
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Cacti store water to survive day heat and night chill.仙人掌储存水分，以抵御白天酷热和夜晚寒凉。
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Camels have thick fur that insulates against cold nights too.骆驼厚密的毛发也能隔绝寒冷的夜晚。