source distance meaning in Chinese

震源矩

The amplitude of the waveform in a borehole with a vertical fracture gradually decreases with the increase of the source distance , but the decrease velocity is varied with the location of the fracture
5 、垂直裂缝地层井内全波幅度随源距增大而逐渐减小，但其降低速率随裂缝位置变化是不同的。
Under the new circumstances , the library should optimize its information services , including the network information source catalogue service , network information source distance service , and network guidance service
面对新形势，在网络环境下，图书馆应优化信息服务，做到优化网络信息资源目录服务、网络信息资源远程服务和网络导航服务。