So, the echoes from a tree are going to a mass of chaotic acoustic reflections, not like the echo from a moth.
所以,树的回声会是一团混乱的声波反射,而不像飞蛾的回声那样。
2
The monitoring technique of rock massacoustic emission is of wide use in the stope stability. A grey model GM (1.1) for scientific forecasting was presented in this paper.
岩体声发射监测技术已广泛应用于采场稳定性研究中,文中提出了能进行科学预报的灰色GM(1.1)模型。
3
The application and practice of acoustic emission technology of rock mass was presented in this paper.