日中 にっちゅう全面 ぜんめん戦争 せんそうであれば
nicchū zemmensensōdeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 日中全面戦争

1. If/when there was a full-scale war between Japan and China; If Japan and China were at full-scale war

Ba Conditional