英文關鍵字
911
app
application
call
car
cellphone
close
closeup
communication
contact
cop
defence
defense
department
detective
dialing
duty
emergency
enforcement
female
force
gadget
helpline
hotline
internet
male
man
mobile
officer
online
patrol
patrolling
phone
police
policeman
policing
safety
security
service
sitting
smart
smartphone
support
technologies
telephone
up
urgency
website
woman