A handheld pointer device provides radiation with a directional characteristic relative to its main axis.
一种手持式指向设备，提供相对于其主轴具有方向特征的辐射。
The directional characteristic of microphone is an important factor in the measurement of directional distribution of sound field.
传声器的指向性对声场方向性分布的测量有很大影响。
Various directional filters can be designed according to the directional characteristic of the frequency spectra of gravitational and magnetic fields.
根据重磁场频谱的这一方向特性，可以设计出各种各样的方向滤波器。
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