新的导管周围低回声信号到底代表什么？

What the heck is this new periductal hypoechoic sign?

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水下目标回声信号的检测是主动声纳目标识别的重要内容。

Detection of echo signal is an important part of underwater object recognition.

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灰阶超声由于低回声信号不易为人眼识别，甚至有用信息丢失。

Because it is not easy to distinguish low signal of grey scale ultrasound by eyes, useful signal loss may happen.

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