機器
activity
assembly
build
carrier
carry
construction
construction site
danger
development
engineering
equipment
frame
grunge
hanging
heavy
high
hook
industrial
installation
iron
job
joint
load
locked
material
metal
old
outside
paint
pipe
protection
repair
risk
rust
safety
scaffolding
security
site
stand
steel
strength
structure
support
temporary
tube
weathered
weight
work
workplace