blast furnace
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高炉で鉄を作る工程を学んだ。
I learned the process of making iron in a blast furnace.
高炉は製鉄業で重要な設備だ。
A blast furnace is important equipment in the steel industry.
工場見学で巨大な高炉を見た。
I saw a huge blast furnace on the factory tour.