英文關鍵字
agricultural
belt
belting
block
bolt
car
close
combustion
control
cylinder
device
drive
dynamo
engine
frame
gear
idling
internal
machine
machinery
mechanic
mechanism
mechanization
motion
motor
pulley
real
revolving
roller
rotate
rotating
rubber
sheave
system
technology
time
torque
tractor
transmission
turn
wheel
work