walk-through metal detector
/ˈweɪdɪŋ ˈbɜːd/
n
English · walk-through metal detector中文 · 金属探测安检门Español · pórtico detector de metalesFrançais · portique détecteur de métal
意味：Visitors are required to walk through a magnetic device that detects the presence of firearms or other metal objects deemed to be dangerous.