In order to keep implementation simple, I start by creating a very simple Echo Service.
为了保持实现的简单化，我首先创建一个非常简单的Echo Service。
We are too often ready to order an echo instead of listening to somebody's heart and too often ready to order a stress test rather than listening to a patient's story.
我们往往追求共鸣而不是倾听别人的心声，往往急于开出负荷试验的处方而不是倾听患者的病史。
The result shows that in order to obtain the strong echo signal, a suitable selection of the ultrasonic transducer operating frequency is necessary.
由此表明，选择合适的声发射换能器，有助于提高液位检测回波信号的强度。
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