十万个为什么·科学启蒙30篇（4）

22 / 30

已读 0 / 30 课

为什么沙漠昼夜温差大

Deserts have very little humidity, so air holds almost no water vapor to trap heat.
During the day, sunlight heats dry sand and rock surfaces rapidly without cloud cover.
At night, this stored heat escapes quickly back into space because there’s no insulating moisture layer.
The lack of vegetation and clouds means no barrier slows radiative cooling after sunset.
Temperatures can drop over 30°C within hours once the sun disappears below the horizon.
Thermal inertia of desert soil is low, so it cools much faster than ocean water or moist earth.
Radiation dominates heat loss in deserts, unlike convection or conduction in humid regions.
Scientists use satellite data to compare desert cooling rates with tropical forest patterns.
This extreme variation shapes how desert animals behave and when they hunt or rest.
Engineers designing solar farms in deserts must consider thermal stress on materials from daily swings.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Radiation dominates heat loss in deserts, unlike convection or conduction in humid regions. 沙漠中热量散失以辐射为主，不同于潮湿地区的对流或传导。
Scientists use satellite data to compare desert cooling rates with tropical forest patterns. 科学家利用卫星数据对比沙漠与热带雨林的降温速率。
During the day, sunlight heats dry sand and rock surfaces rapidly without cloud cover. 白天，阳光在无云遮挡下迅速加热干燥的沙石表面。

这篇中文题目最接近哪一句？为什么沙漠昼夜温差大一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？沙漠湿度极低，空气中几乎不含能保温的水蒸气。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Why Desert Temperatures Swing Wildly Between Day and Night How to cook noodles A maths worksheet

Radiation dominates heat loss in deserts, unlike convection or conduction in humid regions.

Radiation dominates heat loss in deserts, unlike convection or conduction in humid regions.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Radiation dominates heat loss in deserts, unlike convection or conduction in humid regions.