英文關鍵字
armed
back
background
business
center
communication
company
crime
criminal
danger
data
defense
discussion
duty
emergency
facility
guard
information
law
male
man
manager
meeting
member
monitoring
officer
people
person
private
professional
protect
protection
red
room
safety
secret
security
service
sign
solution
staff
strategy
surveillance
system
tactics
talking
team
uniform