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

注意向量 -x 行进方向。

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，声波只不过是通过空气传播压力波。

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

但你可它确实有特殊力，因为它为我们展示行波物理特性。

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

但你可以它具有非凡力量， 因为它将向我们解释行波物理。

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

你可还记得当我们谈到行波时，波速度等于它频率乘以波长。