Real echoes usually fade away before they become thatdistorted, but you can see how it works with an artificialecho on two recorders.
真正的回声常常在被改变时就消失了，但你可以通过两台录音机上的人工的回声知道它们是如何工作的。
2
Artificial intelligence principles are used to determine and analyse the defects according to pulse echo characteristics.
采用人工智能原理，根据脉冲回波特征，对缺陷作出判断和分析。
3
According to the echo area and intensity change of target cloud, the qualitative judgment that the artificial rainfall is effective or not can be gotten.