Those produce a large number of faint reflections in what's called as: a smooth of echo.
这些（松针并不茂密的松树）能产生大量微弱的反射，我们称之为“平滑回声”。
The noise effect on the motion compensation is discussed. To solve the problem, a new method 'which USES echo goodness-of-fit curve to smooth the centroid range trace and phase trace is proposed.
讨论了噪声对补偿的影响，提出了用回波数据拟合曲线来光滑质心距离轨迹和相位轨迹的方法。
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