英语词汇“motion detector”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	motion detector
释义	motion detector motion detector A device to detect intrusion within an area to be protected. The device radiates waves (electromagnetic or ultrasonic, at a fixed frequency) that are reflected back to the device. If an intruder moves within the protected space, a change in frequency results which is detected and which activates an alarm.
随便看	low use, limited access low utilization payment adjustment lowv low vacuum scanning electron microscopy low vaginal swab low-value capital equipment low value consignment relief low value material low value pool low value purchase authorization low value purchase order low value shipment low value short life items low value statement low vapor pressure low variable power optic low variation mix lowveld lowveld centre for lifelong learning lowveld chamber of business and tourism low velocity low velocity aerial delivery low velocity air drop low velocity airdrop delivery system low velocity cloud

英语词典包含2567994条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。