機器
3d
airport
anti
background
baggage
boarding
check
clean
control
departure
destination
detect
detector
embassy
entrance
equipment
flight
fly
frame
gate
guard
illustration
inspect
inspection
isolated
luggage
metal
monitor
precaution
protection
protective
ray
risk
safety
scan
scanner
screening
search
secure
security
steel
system
technology
terminal
terrorism
through
tourism
transportation
travel