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Sentence

かつて光ひかりの媒ばい質しつとしてエーテルが考かんがえられていた。

Span Details

once; before; formerly; ever

adverb, no-adjective

の

possession, attribution, nominalizer, or nominal linker

grammar

媒ばい質しつ

medium; transmission medium

as; in the role of

考かんがえ

think that; believe; hold the view that

-> 考えるichidan verb

passive, potential, or respect auxiliary

-> れる/られるgrammar

ongoing or resultant state

-> ているgrammar

past tense or completed action