科学素养与生活应用·英语30篇（2）

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为什么雷声总在闪电之后才传来？

Lightning heats air instantly to over 30,000°C, causing rapid expansion and shock waves.
These shock waves travel outward as sound — what we hear as thunder.
Light travels nearly one million times faster than sound, so we see lightning first.
The delay between flash and boom helps estimate storm distance in miles or kilometers.
Sound moves at about 343 meters per second in dry air at 20°C.
Humidity, temperature, and wind affect thunder’s speed and how far it carries.
Long rumbles occur when sound reflects off hills, buildings, or layers of air.
If thunder arrives within three seconds, the storm is dangerously close — under one kilometer.
Sometimes lightning is silent because it’s too far for sound to reach clearly.
Scientists use microphone arrays to map lightning paths by analyzing thunder arrival times.

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

Humidity, temperature, and wind affect thunder’s speed and how far it carries. 湿度、温度和风会影响雷声的速度及传播距离。
Lightning heats air instantly to over 30,000°C, causing rapid expansion and shock waves. 闪电瞬间将空气加热至30,000°C以上，引发急剧膨胀和冲击波。
These shock waves travel outward as sound — what we hear as thunder. 这些冲击波向外传播为声音，即我们听到的雷声。

这篇中文题目最接近哪一句？为什么雷声总在闪电之后才传来？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？闪电瞬间将空气加热至30,000°C以上，引发急剧膨胀和冲击波。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 Thunder Follows Lightning With a Delay How to cook noodles A maths worksheet

Humidity, temperature, and wind affect thunder’s speed and how far it carries.

Humidity, temperature, and wind affect thunder’s speed and how far it carries.

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：Humidity, temperature, and wind affect thunder’s speed and how far it carries.