英文關鍵字
big
black
boat
bridge
bright
building
bulk
cable
cargo
chrome
city
colorful
concrete
construction
container
crane
cylinder
detail
equipment
factory
heavy
hoisting
industrial
industry
iron
large
lift
lines
load
machine
machinery
metal
oil
old
outdoor
port
power
rusty
shipping
steel
technology
tool
trade
transportation
tube
urban
work