光比声音快。这就是大部分人在说话之前看起来都很聪明的原因。
Light travels faster than sound. That's why most people seem bright until you hear them speak.
因为光比声音快，所以在人们没说话的时候，个个都看起来很聪明。
Since light travels faster than sound, people appear bright until you hear them speak.
我们的老师告诉我们光比声音传播得快。
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