They emit high frequency pulses of sound through their mouth or nose which bounce off surfaces and objects around them. 它们通过嘴或鼻子发出高频脉冲声，这些脉冲声碰到周围的表面或物体就会反射回来。
A high-voltage and high-frequency pulse sharping circuit was designed according to the principle of magnetic switch technology and magnetic pulse compression technology. 根据磁开关技术和磁脉冲压缩技术的原理，分析设计了一种高压高频脉冲陡化电路。
