機器
accessory
activity
automobile
background
car
chrome
construction
cylinder
development
energy
engine
engineering
equipment
factory
fuel
heavy
hydraulic
hydraulics
industrial
industry
iron
isolated
machinery
machining
manufacture
mechanical
mechanics
metal
metallic
motor
oil
part
piston
power
pressure
repair
shiny
silver
site
steel
technology
tool
tractor
transport
transportation
vehicle
white
working
yellow