機器
accident
attention
bathroom
beware
business
caution
clean
cleaner
danger
dirty
equipment
fall
floor
floors
hazard
indoors
industrial
information
job
man
message
nobody
object
occupation
outdoor
person
plastic
polishing
professional
public
restaurant
risk
safety
service
sign
slip
slippery
space
symbol
tool
warning
water
wet
white
wood
wooden
work
working
yellow