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。

youdao

He says it is possible to detect different species of mosquito because their wings beat with a distinctive frequency.

他表示，检测不同种的蚊子是有可能的，因为它们翅膀扇动的频率有着明显区别。

youdao

It does this by fitting small piezoelectric acoustic sensors to parts of the structure to detect the particular frequency of noise caused by a crack in aircraft-grade aluminium.

把小型压电声传感器安装到这种构造部位上，检测由航空级铝材裂纹所致的特定频率的噪音，靠这样就能监测飞机裂纹。

youdao

Maybe you can put the frequency of the higher pitches as high so you can detect the sound quicker and That's it exactly.

大概是把频率调到更高的音高后,就能更敏捷地感觉到声音的变化,而那就是原因了

耶鲁公开课 - 聆听音乐课程节选

It is designed to detect the low-frequency radio pulses emitted by lightning strikes.

ECONOMIST: A new way of protecting planes from the ash from volcanoes

Though these changes can go unnoticed by a person with a disease, relatives and friends more often pick up on it, but a computer algorithm that detects nuances of speech and subtle changes could detect abberations with much greater frequency.

FORBES: New Software Can Diagnose Parkinson's Disease Simply By Listening To Your Voice

Patwari plans more research on whether different or multiple radio frequencies might detect breathing better than the one 2.4 gigahertz frequency used in the study.

ENGADGET: Researchers use wireless network to monitor breathing, could save lives