英文關鍵字
abstract
action
active
chains
circle
clockworks
cogs
complexity
concepts
convert
cooperate
curve
driving
efficiency
engine
engineering
equipment
factory
gears
groove
human
industrial
industry
invention
isolated
machinery
machines
manufacturing
mechanics
motion
motor
objects
operation
parts
pinion
power
progress
revolve
rim
teamwork
technology
tools
tooth
transform
turning
wheels
work