Any of various electronic instruments for detecting the presence of metallic objects by means of their effects on an electromagnetic field; spec. (a)…
A device which is designed to transmit a signal and which can therefore be traced when attached to a moving vehicle, etc.
英语词典包含1132095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。