英文關鍵字
accident
apparatus
appliance
bird
birds
breakage
breakdown
cable
casualty
check
communication
computer
control
crash
dangerous
device
dove
electric
electrical
electricity
failure
fault
fixture
housing
incident
line
locking
malfunction
nest
pigeon
protection
safety
security
shortcircuit
situation
tangle
telecommunication
traffic
train
trains
turtle
turtledove
unit
violation
wire
wires
wiring
wreck