“高频率声波使得声音束很集中，周期很短。” 他说。
"The high frequencies make the bats' sonar beam very focused and short-ranged, " he said.
因此，高斯束谐振系统对高频遗迹引力波的频率和传播方向具有良好的选择效应。
Therefore, GBRS have a useful selective effect with respect to the frequency and propagation direction of relic HFGWs.
采用高频脉冲微束等离子弧做为电子管阴极和光刻栅极装配钎焊工艺的热源，提高了钎缝质量和产品的可靠性。
Brazing quality and product reliability are both increased as using high frequency pulse microplasma arc heating process for assembly brazing of cathode and photoetching grid of electron tube.
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