英文關鍵字
activity
big
boat
bridge
bright
building
bulk
bulldozer
cargo
city
colorful
concrete
construction
crane
detail
devices
equipment
heavy
hoisting
hydraulic
industrial
industry
iron
large
lift
load
machine
machinery
mechanical
metal
old
outdoor
part
platform
pressure
rusty
shipyard
sky
steel
support
system
technology
terminal
tower
wheeled
work