a machine that you move over the ground or a surface to discover if there is metal there

中文解释

（用于探测地下是否埋藏有金属的）金属探测器 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。