光速比声速快
The speed of light is faster than that of sound
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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.
youdao
光速比声速快。
Light travels are faster than sound.
Light travels faster than sound.
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