1·Ultrasound is used by many animals that detect and some of them send out very high frequency sounds.
许多动物都用超声波来进行侦查，有些动物还能发出非常高频的声音。
2·Raytheon Company (NYSE: RTN) and the U.S. Army recently completed successful testing of the first Advanced Extremely High Frequency, or AEHF, satellite communications production terminals.
雷神公司和美国陆军最近成功完成首个先进极高频或AEHF卫星通信生产终端测试。
3·Researchers at Fraunhofer Institute for High Frequency Physics and Radar Techniques in Wachtberg, Germany, have developed a sensor that can see through the smoke.
在德国Wachtberg的弗劳恩·霍夫高频物理学和雷达技术研究所，研究人员已经开发出一种能看穿烟雾的传感器。
4·High frequency pulse width modulation power control systems can be realized using semiconductor switches.
高频脉冲宽度调制电力控制系统，可以实现用半导体开关。
5·High frequency switching power supply made from it can not only simplify the circuit, but also can improve the EMC characteristics and reduce the cost.
采用它制作高频开关电源，不仅简化了电路，同时可以改善电源的电磁兼容性能，且降低了制作成本。