英文關鍵字
accident
avoid
back
background
beware
building
careful
caution
clean
cleaner
construction
damaged
danger
defective
door
equipment
fall
floor
front
glasses
icon
industrial
information
interior
lobby
maintenance
mind
mistakes
outdoor
plastic
safety
sign
signal
slip
slippery
step
surface
symbol
warning
wet
wood
worker
yellow