Mary-Ann smiled. Notwithstanding her black decayed teeth there was in her smile something sweet and touching.

玛丽—安笑了。 尽管她有一口黑蛀牙，但是她的笑容还是显得很甜美动人。

So if this is a picture of my black teeth, I have a pink tissue above my mouth -- or in my mouth -- that surrounds my teeth like this, and these are called " gums" .

所以如果这是一张我黑牙的照片，我的嘴上方——或嘴里——有一个粉红色的组织像这样围绕着我的牙齿， 这些被称为“牙龈” 。