英文關鍵字
adjust
close
closeup
danger
dark
design
detail
disk
engineering
equipment
gear
gears
heavy
indoors
industry
inside
instrument
interior
iron
jagged
light
machine
machinery
maintenance
metallic
mining
modern
new
nobody
part
pinion
plant
power
reflection
repairing
shadow
slow
steel
technology
teeth
turning
wheel
work