機器
architecture
cogwheel
combustion
concept
construction
design
details
development
energy
engine
engineering
equipment
exhaust
fuel
gear
geometric
industrial
industry
internal
machinery
mechanics
mechanism
metal
metallic
motor
new
piston
power
powerful
precision
professional
propulsion
shaft
shapes
shiny
steel
technology
titanium
torque
transmission
transportation
turbo
valve
wheel