尿道大多数哺乳动物自上尿液从膀胱中排出体外的管道，雄性的精子可从中排出 The canal through which urine is discharged from the bladder in most mammals and through which semen is discharged in the male.
那份报告是有关哺乳动物的体温调节。 The report is on mammalian thermoregulation.
鲸鱼和马一样都是哺乳动物。 A whale is no less a mammal than a horse is.
