51.729 观看次数
Air bubbles travel from the nose to the lungs. In the swampy, mucus-filled areas, they meet the red blood cells that transport them around the body.
第一次约会 : Sep 13, 1987
上次播出日期 : Mar 13, 1988
插曲 : 26 插曲
季节 : 1 季节
运行: 26 分钟
