First, note the direction that the wave is traveling, in the x-direction.

量在 -x 中的行进方。

Today, you learned about traveling waves, and how their frequency, wavelength, and speed are all connected.

今天，您了解了行波，以及它们的频率、波长和速度如何相互关联。

And as we've talked about, sound waves are nothing but traveling pressure waves through the air.

正如我们所讨论的，声波只不过是通过空气传播的压力波。

But you might say that it does have special powers, because it’ll demonstrate for us the physics of traveling waves.

但你可能会说它有特殊的能力，因为它会为我们展示行波的物理特性。

But you might say that it does have special powers, because it'll demonstrate for us the physics of traveling waves.

但你可以说它具有非凡的力量， 因为它将我们解释行波的物理。

You might remember when we talked about traveling waves that a wave's speed is equal to its frequency times its wavelength.

你可能还记得当我们谈到行波时，波的速度等于它的频率乘以波长。