海战，有许多只发生在美国海岸线之外，还有一些战役却发生在距美国海岸线很远的国际海域。

Many battles took place just off the coast of the United States. Many others took place farther away, in international waters.

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捕捉过程是这样的，因为低频波可以传输到更远的距离，当它们遇到地下的空穴或其他物体反射回来的时候，已经距地面的接收装置很远了。

The catch is that because low-frequency waves can travel great distances, when they do bounce off cavities or objects underground, they often end up far from the detection equipment at the surface.

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但是，由于它位于距地球很远的一边，我们只能在太空中才能看到它。

But, since it's on the far side of the moon, it can only be seen from space.

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