十万个为什么·科学阅读30篇（5）
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Why Does Thunder Come After Lightning?
为什么先看到闪电后听到雷声？
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Lightning makes a huge flash and a loud sound at once.闪电同时产生强烈的闪光和巨大的声响。
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Light travels faster than sound—nearly one million times faster.光速远超声速——几乎快一百万倍。
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We see lightning almost instantly, even far away.我们几乎能瞬间看到远处的闪电。
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Sound moves slower, about one kilometer in three seconds.声音传播较慢，约三秒行进一公里。
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That’s why we count seconds to guess storm distance.因此我们通过数秒来估算雷暴距离。
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Hot air from lightning blasts outward as a shockwave.闪电产生的热空气以冲击波形式向外爆发。
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This shockwave becomes the rumbling sound we call thunder.这种冲击波就形成了我们称之为雷声的隆隆声。
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Sometimes echoes make thunder last longer.有时回声会让雷声持续更久。