为什么在打雷时，我们总是先看到闪电后听到雷声？
When it thunders why do we see the lighting first, then hear the thunder?
问：为什么在打雷时，我们总是先看到闪电后听到雷声？
Q: When it thunders why do we see the lighting first, then hear the thunder?
问：为什么在打雷时，我们总是先看到闪电后听到雷声？
Q: When it thunders why do we see the lighting first, then hear the thunder?
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