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.
