英文關鍵字
air
architecture
atmosphere
big
bridge
building
chemical
chimney
cloud
color
colorful
construction
cylinder
emissions
energy
engine
environment
factory
heavy
industrial
industry
iron
ironworks
large
loading
manufacture
manufacturing
metal
metallurgical
nobody
old
pipe
plant
pollution
power
rust
scene
smog
smoke
smokestack
steam
steel
structure
travel
tree
urban
view
water
works