科学为什么·英语30篇（1）

9 / 30

已读 0 / 30 课

为什么有些云像棉球而另一些又扁又灰？

Cloud shapes reveal how air moves: puffy cumulus clouds form when warm, moist air rises rapidly and cools to condense.
Their cauliflower texture comes from strong updrafts and turbulent mixing, making them common on sunny afternoons.
Stratus clouds, by contrast, form in stable, layered air masses where gentle lifting spreads moisture evenly like fog lifted off ground.
That uniform motion creates smooth, gray sheets often covering the whole sky and bringing drizzle—not heavy rain.
Cumulonimbus clouds combine both features: towering vertical development with anvil-shaped tops caused by wind shear at high altitudes.
Altitude matters too—high cirrus clouds are thin and wispy because ice crystals form in very cold, dry upper air.
Pilots and meteorologists classify clouds by height and shape to forecast weather changes within hours.
Even small cloud variations help us read atmospheric conditions—like spotting lenticular clouds near mountains, signaling strong winds aloft.

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

Pilots and meteorologists classify clouds by height and shape to forecast weather changes within hours. 飞行员和气象学家依据云的高度与形状分类，以预测数小时内的天气变化。
Their cauliflower texture comes from strong updrafts and turbulent mixing, making them common on sunny afternoons. 其花椰菜状纹理源于强烈的上升气流和湍流混合，因此常见于晴朗的午后。
Cloud shapes reveal how air moves: puffy cumulus clouds form when warm, moist air rises rapidly and cools to condense. 云的形状揭示了空气的运动：蓬松的积云由暖湿空气快速上升、冷却凝结而成。

这篇中文题目最接近哪一句？为什么有些云像棉球而另一些又扁又灰？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？云的形状揭示了空气的运动：蓬松的积云由暖湿空气快速上升、冷却凝结而成。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 Do Some Clouds Look Like Cotton Balls While Others Are Flat and Gray? How to cook noodles A maths worksheet

Pilots and meteorologists classify clouds by height and shape to forecast weather changes within hours.

Pilots and meteorologists classify clouds by height and shape to forecast weather changes within hours.

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：Pilots and meteorologists classify clouds by height and shape to forecast weather changes within hours.