常见例句Food fish (Oncorhynchus nerka) of the North Pacific that constitutes almost 20% of the commercial fishery of Pacific salmon. 北太平洋食用鱼，学名为Oncorhynchus nerka。几乎占太平洋鲑鱼产量的20%25。Nerka virus 纳尔卡病毒 返回 nerka