a device that signals the occurrence of some undesirable event
例句
用作名词 (n.)
Every savings bank is installed with an automatic warning device. 每个银行储蓄所里都设有自动报警装置。
This paper introduces a microcomputer in a coal mine methane concentrations exceeding the detection alarm device design and debugging methods. 介绍了一种采用单片机的煤矿甲烷浓度超标检测报警装置的设计与调试方法。
美
