英文關鍵字
business
circle
clock
cogwheel
component
concept
cooperation
design
element
engine
engineering
equipment
factory
gear
gears
here
high
industrial
industry
machine
machinery
mechanical
mechanics
mechanism
modern
power
preciseness
precision
presented
roll
rotate
rotating
rotation
round
solid
steel
steering
system
technology
time
transfer
transmission
turn
video
wheel