英文關鍵字
amounts
black
britain
carbon
casting
chemical
closed
coast
coke
continous
danger
dioxide
due
east
economic
energy
fire
flame
gas
heat
hydrocarbon
hydrogen
identity
laser
live
living
machine
markers
methane
mixture
natural
naturally
now
occurring
oven
people
percentage
plant
pollution
power
pressure
public
redcar
safe
safety
skill
skilled
small
steam
steel
steelmaking
steelplant
sulfide
waste
water
winter
works