声波

Where there is a sound, there must be sound waves.

有声音的地方，一定有声波。

We cannot see sound waves as they travel through...

声波在空气中传播时，是看不见的。。。

This enables them to collect more sound waves and thus hear better.

这使它们能收集更多的声波，从而听得更清楚。

Sound is the vibration of sound waves is a physical energy.

声音是声波的振动，是一种物理能量。

We cannot see sound and waves as they travel through air .

声波在空气中传播时是看不见的。

What are the characteristics of sound waves underwater?

那么在水下的声波有什么特性？

There are various ways to measure distance, including ultrasonic sound waves and infrared light.

有各种不同的方法来测量距离，包括超声波声波和红外光。

When you talk , you set up sound waves .

当你说话时，在你的发音部位就形成各种异样的声波。

We know light waves are different in frequency just as sound waves are.

我们知道光波像声波一样在频率方面是不同的。

The sparker was originally developed for fundamental studies of underwater sound propagation and of subbottom geology.

火花发生器原来是为了进行关于水下声波传播及海底地质的基础性研究而制造的。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。