Asking when the first measurement of the speed of sound took place.
询问第一次测量声速是什么时候进行的。
| Expression | 第一次测量声速是在什么时候？ |
|---|---|
| Meaning | When did the first measurement of the speed of sound take? |
| Reading | dìyīcì cèliáng shēng sù shì zài shénmeshíhou |
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