補欠 ほけつ分子 ぶんし ぞくだったら
hoketsubunshizokudattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 補欠分子族

1. If/when [it] were a complementary molecular family; If [it] were a member of a complementary molecular family

Tara Conditional