By comparison with simple shape targets, the echo strength of the complex targets versus frequency and range is more complex.
与简单形状目标相比，复杂目标的回声强度随频率和距离的变化更为复杂。
By comparison with simple shape targets, the echo strength of the complex targets versus frequency and range is more complex.
与简单形状目标相比，复杂目标的回声强度随频率和距离的变化更为复杂。
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