... differential tolls 不划一收费 diffracted path 衍射路径 diffuser cap 扩散器盖 ...
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The NLOS sound signal usually arrives at acoustic array by diffraction, and the diffracted transmission path is a geodesic according to the extensive Famat's principle.
非视距声信号通常经过绕射到达基阵，根据广义费马原理，传播路径为一条短程线。
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