noun 下载 🔗分享 海牛,美人鱼. Any of several plant-eating marine mammals, of family Trichechidae, found in tropical regions. Examples : "While visiting Florida, we saw manatees swimming slowly in the warm river. " 在佛罗里达州旅游的时候,我们看到海牛,也就是俗称的美人鱼,在温暖的河里缓慢地游动。 animal biology ocean environment nature ecology 与AI对话词汇游戏阅读练习