科学素养与生活应用·英语30篇(3)
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Why Thunder Follows Lightning
为什么雷声总在闪电之后
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Lightning heats air to over 30,000°C in a flash.闪电瞬间将空气加热至超过30000℃。
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This sudden heat makes air expand very fast.这种骤然升温使空气急速膨胀。
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The fast expansion creates a loud sound wave.急速膨胀产生强烈的声波。
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That sound wave is what we hear as thunder.这种声波就是我们听到的雷声。
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Light travels faster than sound, so we see first.光速快于声速,所以我们先看到闪电。
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If lightning is one kilometer away, thunder arrives in three seconds.若闪电距你一公里,雷声约三秒后到达。
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Thunder cannot happen without lightning.没有闪电就不会有雷声。
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You can estimate storm distance by counting seconds.你可以通过数秒来估算风暴距离。