英文關鍵字
accident
alertness
ambulance
arrest
assistance
authority
car
chasing
cop
crime
criminal
danger
deputy
doctor
driving
drunk
emergency
enforcement
firefighter
first
flying
help
hope
horizontal
investigation
land
law
light
medical
men
outdoors
people
police
problem
protection
rescue
responsibility
road
safety
secret
security
sheriff
siren
speed
street
traffic
transportation
urgency
vehicle
warning