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Sentence
Span Details
平炉法
open-hearth processnoun
は
topic markergrammar
かつて
once; before; formerly; ever; never yet; never before; first time-> 嘗てadverb, no-adjective
鉄鋼
iron and steelnoun
生産
production; manufacturenoun, suru verb
の
possession, attribution, nominalizer, or nominal linkergrammar
主流
mainstream; main current; prevailing trend; main stream; main course (of a river)noun, no-adjective
だった。
past copulagrammar