機器
abstract
alloy
awd
background
black
business
car
communication
concept
construction
cooperation
defect
detail
dirty
gear
grease
group
ideas
image
industrial
industry
interaction
iron
lubrication
machinery
macro
material
mechanical
mechanism
metal
oily
partnership
pinion
repair
stainless
steel
studio
teamwork
technical
technology
teeth
torque
transmission
transport
transportation
turning
vehicle
workshop