機器
background
bond
circle
clockwork
concept
conceptual
connect
constructor
dam
depth
design
dirty
disk
energy
engine
engineer
engineering
equipment
factory
gear
helical
idea
industrial
industry
iron
joint
machinery
manufacturing
mechanic
mechanical
mechanism
metal
metallic
power
precision
production
project
rotate
rusty
sawtooth
sharp
sky
sluice
space
steel
teeth
valve
water
wheel