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”。
Meterials and Methods: Reviewing the ultrasonic data of 76 cases with spleen mass proved by operation and pathology. The size, number, border, interior echo of the lesions were analysed.
材料和方法：回顾性分析76例脾脏肿块患者的超声检查资料，分析脾脏肿块的大小、数目、边界、内部回声等多种超声表现。
Automatic recognition of target number is realized through processing of target echo, and some practical results is given at end of this article.
通过对目标回波的处理，实现了目标架数的自动识别。最后给出了它们在实际应用中的结果。
The simulation of the system of single-photon detection for the space targets is carried out based on these models to get the number of laser photon echo which is simulate value.
利用所建立的模型对探测系统进行仿真，得到激光回波光子数模型仿真值。
The simulation of the system of single-photon detection for the space targets is carried out based on these models to get the number of laser photon echo which is simulate value.
利用所建立的模型对探测系统进行仿真，得到激光回波光子数模型仿真值。
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