人体显微照片：当精子遇上卵子
发布: 2009-3-16 16:20 | 作者: webmaster | 来源: 本站原创 | 查看: 444次
7.牙釉质 Tooth plaque
牙釉质
要有一口亮丽牙齿，经常刷牙非常有必要，因为牙齿表面的牙釉质看起来就像“煮熟的老玉米”。
Brush your teeth often because this is what the surface of a tooth with a form of “corn-on-the-cob” plaque looks like.
