機器
backup
build
cellar
concrete
connection
deep
depth
development
drilling
drinking
dwelling
electric
engine
estate
fashioned
float
flow
frame
grunge
hole
housing
industrial
industry
job
maintenance
material
motor
pipe
plumbing
power
pressure
problem
pump
real
repair
residential
rope
rough
safety
shiny
structure
supply
system
technology
tool
tube
well
work