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 snorkeling in Florida, we saw a gentle manatee grazing on seagrass. " 在佛罗里达浮潜时,我们看到了一只温顺的海牛(美人鱼)正在吃海草。 animal ocean biology environment 与AI对话词汇游戏阅读练习