常见例句用作名词 (n.)It was extinction by dilution, and to the ornithologists it was just as tragic as the more dramatic demise of the passenger pigeon or the Carolina parakeet.对鸟类学家来说，这和北美候鸽或卡罗来纳长尾小鹦鹉大批大批地死亡同样悲惨。 返回 passenger pigeon