Man and most other mammals are viviparous. 人和其他大多数哺乳动物都是胎生的。
Among mammals whales have the greatest mass. 哺乳动物中以鲸鱼最大。
mammals英英释义
名词 mammal:
any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk
