機器
abstract
background
bearing
chips
cog
construction
crankshaft
cutter
cutting
cylindrical
engineer
engineering
equipment
gear
hob
hobbing
industrial
iron
lubricant
lubrication
machinery
manufacture
manufacturing
master
mechanical
mechanism
metal
metalwork
metalworking
mill
milling
movement
oil
oiling
part
precision
processing
production
quality
screw
shaft
spiral
steel
technique
technology
teeth
toned
tool
working