如果视距被阻挡，则可利用某一中间地点做为中继站，以建立一条迂回路径。
If the line of sight is obstructed, sometimes an alternate path can be established using an intermediate site as a repeater.
对于长距离路径，则必须仔细勘查两个设施问的路径，确保在视距以内没有地形上或人为的障碍物。
For longer paths, detailed path surveys may be required to determine that there are no topographic or man-made obstructions blocking the line of sight between the two facilities.
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。
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。
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.
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