英文關鍵字
aggregation
air
brown
building
capacity
construction
cooling
dirty
enterprise
environment
equipment
external
factory
hard
heavy
highpowered
industrial
industry
iron
jet
manufacturing
mechanism
metal
metallurgical
metallurgy
old
outdoors
pipe
power
raid
rolling
rotating
rust
smelting
spooky
steel
structure
tank
technics
technology
turbine
water
work