英文關鍵字
abstract
background
bailer
carbon
casting
coal
coke
element
equipment
factory
ferrosilicon
ferrous
furnace
geology
industrial
industry
isolated
manganese
manufacture
melt
metal
metallic
metallurgical
metallurgy
mine
mineral
natural
nature
nugget
operation
ore
pattern
produce
quartz
red
sample
shiny
smelting
stone
technology
texture