機器
background
beware
black
build
close
construct
construction
cray
creative
danger
dark
dig
dirty
force
grain
ground
grunge
horizontal
labor
layout
man
manpower
mark
old
overlay
pattern
road
rock
rough
safety
shadow
sign
signage
soil
square
stone
stop
street
stripe
symbol
texture
unclean
under
warning
website
work
worker
yellow