エチレン けい炭化 たんか水素 すいそだったら
echirenkeitankasuisodattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of エチレン系炭化水素

1. If it were an ethylene-based hydrocarbon.; If it’s an ethylene-based hydrocarbon.

Tara Conditional