機器
accuracy
background
business
circle
clock
clockwork
closeup
cogwheel
concepts
cooperation
coordination
copyspace
design
details
engine
engineering
equipment
inside
instrument
isolated
leather
machinery
macro
measurement
mechanical
mechanism
metal
pinion
precision
quality
small
steel
strap
teamwork
technical
technology
time
turn
watch
wheel
white
work
working
wristlet
wristwatch