... directional single-plane jet perforator 单面定向聚能弹射孔器 directional source 定向震源 directional structure 定向构造 ...
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non-directional point source 无定向点震源
directional traffic power source 方向电源
directional sound source 定向性声源
directional point source 无定向点震源
directional acoustic source 定向声源
The directional source and environmental noise are further considered, and the effects of the effective length of transmitted signal on the receiver performance are investigated.
进一步考虑了发射源的指向性以及环境噪声的因素，同时分析了发射信号有效宽度对接收器检测性能的影响。
But if the goal is to reproduce sounds accurately, then a speaker must be either an acoustic point source (monopole, omni-directional) or an acoustically small bi-directional source (dipole).
但是，如果目标是精确的重放声音的话，一个扬声器必须是声学上的点声源(单极点，全向响应)，或者是一个声学上小的双向源(偶极)。
The young turtles, however, use the field primarily as a source of directional information for maintaining a heading.
然而，幼小的海龟主要利用磁场作为维持前进方向的信息来源。
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