英文關鍵字
bagel
bar
bolt
bolts
brass
classic
compressor
container
cylinder
discipline
dope
engineering
gear
industrial
influence
inner
inside
interior
iron
locomotive
machine
machinery
mechanical
metal
motor
nuts
old
pipe
position
power
pressure
reservoir
rotation
share
sleeves
steel
strength
stroke
tank
tavern
unit
valve
valves
wheel