機器
agent
clean
cleaner
cleaning
cleanliness
cleanser
color
contour
drain
finance
graphic
grate
gutter
hole
icon
icons
illustration
industry
isolated
items
line
linear
lined
outline
pictograms
pipeline
piping
plumber
plumbing
section
service
sewage
sewerage
sign
signs
sprayer
symbol
system
tool
tube
water
white
worker