機器
arabian
architect
architecture
builder
business
businessman
career
caucasian
chain
cog
cogwheel
concept
connection
construction
contractor
control
crane
development
engine
engineer
engineering
gears
hardhat
helmet
industrial
industry
job
man
mechanism
metal
middle easterners
outdoors
people
person
professional
progress
pulling
safety
site
sky
structure
success
symbol
teamwork
technology
vest
wheel
work
worker
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