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When did the first measurement of the speed of sound take? 第一次测量声速是在什么时候？
Airliners in service at present cannot fly faster than the speed of sound. 目前供使用的客运机飞行速度不能超过音速。
A device for measuring the speed of sound in water. 速度计，速度表用于测量声音在水中的速度的仪器
The speed of light is faster than that of sound. 光速比音速要快。
New planes can fly at the speed of sound. 新型飞机可以音速飞行。
The new airplane flies at twice the speed of sound. 这架新型飞机以两倍于音速的速度飞行。
Mach two equals twice the speed of sound. 二马赫相当于声速的二倍。
Modern planes top the speed of sound. 现代飞机超过音速。
The speed of sound in water is about four as great as in air. 声音在水中的速度是空气中的四倍左右
The speed of sound varies in solids,liquids and gases. 在固体、液体和气体中，声音的速度不一样。
The speed of sound varies in solids, liquids and gases. 在固体、液体和气体中,声音的速度不一样。
When did the first measurementof the speed of sound take? 第一次测量声速是在什么时候?
The speed of this aircraft is very high. 这架飞机的速度非常快。
If a plane is flying at Mach 2, it is flying at twice the speed of sound. 假如飞机以二马赫的速度飞行，那么它的速度就是音速的两倍。
The speed of a runaway horse count for nothing. 脱缰之马的速度毫无价值。
If a plane is flying at Mach 2,it is flying at twice the speed of sound. 假如飞机以二马赫的速度飞行，那么它的速度就是音速的两倍。
The speed of light is an important constant. 光速是一个重要的常数。
The effect of finite-range force fot the speed of sound is very small. 有限力程部分对声速的影响很小。
The speed of the toy boat is variable. 玩具船的速度是可变的。
One quick side note: the speed of sound varies with the condition of the air. 从侧面可以知道：声音的速度受空气条件的影响而出现变化。