英文關鍵字
industry
copper
modern
bright
plant
factory
metallurgy
iron
foundry
industrial
heavy
hot
technology
metallurgical
melting
liquid
production
steel
fire
heat
furnace
molten
metal
danger
smelting
manufacturing
manufacture
light
temperature
equipment
flame
burn
blast
red
cast
spark
mill
flowing
power
metallic
slag
protection