无线电波的波长较长，因此只有大物件可以反射它们。
These have long wavelengths and therefore bounce only off large things.
波长较长的波比波长较短的波易形成衍射。
Waves of long wavelength are diffracted more than those of short wavelength.
不同之处是雷达发出的是无线电波，这种波波长较长，反射体只能是大个物体。
The difference is that radar depends on radio waves. These have long wavelengths and therefore bounce only off large things.
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