機器
angle
architecture
building
bunch
business
civil
construction
crane
earth
engineering
equipment
excavation
ferrous
foundation
girder
heap
heat
heavy
industrial
industry
iron
job
material
metal
metallurgy
new
outdoor
outside
pile
plant
plate
protect
retaining
river
rock
rough
rust
safety
sheet
soil
steel
structure
technology
transport
transportation
underground
walls
warehouse
work