This is useful only for waves that are too big to jump over but still too small to dive through or go under.
这只是当波浪大的不能跳过但是又小的不能潜水或者从下面穿过的时候才有用。
The waves of this radiation can have different wavelengths (distance between wave "tops"). The wavelength can go from ultra small (xrays for example) to very wide (radio transmissions).
它有不同的波长，从很短的紫外到很长的红外。
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