英文關鍵字
auto
chrome
circle
circular
closeup
control
design
detail
emergency
engine
engineering
equipment
factory
fiber
fuel
gallon
gas
gasoline
gear
grinder
industrial
industry
inside
iron
lathe
machine
machinery
machining
manufacturing
mechanical
metal
metallic
metalworking
modern
motor
moves
plant
power
powerful
precision
production
protection
pump
safety
shiny
sparks
steel
storage
synthetic
tank
technology
tool
transportation