当我小的时候我渐渐地知道光速比声速快。
I had known that light travels faster than sound gradually when I was young.
光速比声速快。
光速比声速快。
光速比声速快很多，这就是为什么在你听到有些人说话之前他们看起来很聪明。
Light travels faster than sound. That's why some people appear bright until you hear them speak.
光速比声速传播得快。
光速比声速传播得快。
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