metal detector
noun [ C ] uk/ˈmet.əl dɪˌtek.tər/ us/ˈmet̬.əl dɪˌtek.tɚ/
（用于探测地下是否埋藏有金属的）金属探测器
a machine that you move over the ground or a surface to discover if there is metal there
He walks around fields and beaches with his metal detector, hoping to find buried treasure. 他带着金属探测器在田间和海滩上四处走动，希望发现埋藏的宝藏。
（在机场等地用于探测危险或非法物品的）金属探测器
a machine that you walk through at places such as airports, to discover if you are carrying anything dangerous or illegal