noun 下载 🔗分享 河马 A large, semi-aquatic, herbivorous (plant-eating) African mammal (Hippopotamus amphibius) Examples : "The zookeeper explained that the hippopotamus spends most of the day in the water to stay cool. " 动物园管理员解释说,河马大部分时间都待在水里,这样可以保持凉爽。 animal nature organism biology environment 与AI对话词汇游戏阅读练习