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Sentence
Span Details
エチレン系炭化水素
alkene; olefin; ethylene hydrocarbonnoun
は、
topic markergrammar
かつて
once; before; formerly; ever; never yet; never before; first time-> 嘗てadverb, no-adjective
アルケン
alkene; olefinnoun
の
possession, attribution, nominalizer, or nominal linkergrammar
総称
general term; generic name; collective termnoun, suru verb
として
as; in the role ofgrammar
使わ
use; make use of; employ; handle; spend; consume; speak-> 使うgodan verb
れ
passive, potential, or respect auxiliary-> れる/られるgrammar
た。
past tense or completed actiongrammar