機器
3d rendering
agreement
background
car
closeup
cog
cogwheel
concepts
conjugation
connection
cooperation
design
drawing
engine
engineering
equipment
evolution
example
falling
gear
harmony
ideas
industrial
industry
interior
lift
machinery
mechanical
mechanics
mechanism
metal
metallic
part
pinion
reducer
reduction
rotation
shaft
shiny
steel
technicalities
texture
torque
training
transmission
view
wheel