機器
abrasive
ancient
antique
architecture
blue
bolt
build
business
caucasian
cement
closeup
concrete
construction
crane
cut
development
device
electrical
engineering
equipment
fabrication
factory
form
friction
grind
grinder
hands
heavy
high
hone
hot
industrial
industry
infrastructure
island
knife
machinery
man
manufacture
manufacturing
mediterranean
men
metal
modern
overpass
people
person
power
preparation
process
production
professional
projects
repairing
shape
sharpen
sharpening
site
sky
spark
stand
steel
structure
supports
teamwork
technology
tool
tradition
traditional
typical
urban
vintage
warehouse
wheel
wooden
work
worker
workers