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メタン系 けい炭化 たんか水素 すいそでした
metankeitankasuisodeshita

敬
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Noun
, 
Desu Copula

The polite past form of メタン系炭化水素

1. Was a methane-based hydrocarbon.

Past/Perfective
, 
Polite

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メタン系炭化水素でした

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