sound ray meaning in English

声辐射线
声线自声源发出，代表能量传播方向的曲线，声的波动性质不计。注在各向同性的媒质中，声线就是代表波的传播方向，处处与波阵面垂直的曲面

So in chapter 4 , the idea of sound ray revise is discussed
因此在第四章，讨论了声线修正软件的设计和思想。
Sound ray tracking plotter
声线轨迹仪
This paper proposes a set of software for sound ray calculating , which can calculate the traces and the travel time of the rays in the sound field and search the eigenrays arrival at the receiving point
本文基于射线声学理论编制了一套声线计算软件，软件可以计算声场中的声线轨迹和传播时间以及搜索到达接收点的本征声线。
The sound speed distribution of ocean is not uniform , so the sound ray is often curving because of refraction when sound transmitting through the sea channel . this means the time delay between the transmitter and the receiver is larger than the time delay between them in the condition that the sound ray is straightaway , then positioning error is caused
海洋中声速分布是不均匀的，因此由于折射效应，声音在海洋信道传播过程中其声线是弯曲的，声线弯曲意味着声信号从发射点到接收点的传播时延大于声信号直线传播的时延，致使定位产生误差。