英文關鍵字
accident
alarm
arrest
authority
auto
automobile
blue
car
cop
crime
danger
delinquent
duty
emergency
enforcement
engine
equipment
fighting
fire
force
help
law
light
officer
operation
orange
order
outdoor
patrol
police
policing
protect
protection
raid
red
rescue
safety
security
service
siren
sky
surveillance
terrorism
transportation
truck
urban
urgency
vehicle