英文關鍵字
activity
africa
bolt
cable
cog
construction
counterbalance
counterweight
crane
development
drive
elevation
engineering
equipment
gear
heavy
hoist
hoisting
industrial
industry
iron
lift
lifting
mechanical
mechanism
metal
metallic
motion
motor
power
pulley
rope
rotation
shaft
site
spin
spinning
spoke
sprocket
steel
system
technology
tool
tower
transmission
turning
wheel
winch
winder
wire