metal detector
noun/ˈmetl dɪtektə(r)/
/ˈmetl dɪtektər/
- an electronic device that you use to look for metal objects that are buried under the ground
金属矿藏探测器 - an electronic machine that is used, for example at an airport, to see if people are hiding metal objects such as weapons
（机场等处的）金属物品检测机