機器
blue
build
building
business
construction
constructor
crane
development
engineer
equipment
exterior
framework
future
hoist
hook
housing
hydraulic
industrial
industry
infrastructure
investment
iron
laborer
machinery
material
metal
profession
progress
project
property
real estate
reinforcement
residence
revolution
rod
safety
scaffold
site
sky
steel
structure
survey
technology
tool
tower
under construction
wire
work
worker