機器
environmental
clean
clear
construction
drink
drinkable
energy
environment
equipment
facility
factory
faucet
filter
filtration
fresh
healthy
illustration
industrial
isolated
line
liquid
metal
mineral
modern
natural
nature
object
pipe
pipeline
plastic
pressure
production
pump
pure
purification
purifier
purity
reservoir
sanitary
service
sewage
storage
supply
system
technology
treatment
tube
vector
water