Millions of these rods packed together make up the enamel layer of your teeth.

这些成千上万的结晶物排列堆积，形成了你的牙釉质。

Those are bundled into rods, packed together, tens of thousands per square millimeter, to form the shield-like enamel layer.

这些物质集合成捆，紧密地排列起来，每平方毫米可达到上万个，组成如盾牌般坚硬的牙釉质层。

Another common symptom is regurgitation, where undigested food and a bit of gastric acid go back up into the mouth, and can cause acidic taste, or even damage of the enamel layer of teeth.

另一个常见的症状是反流，未消化的食物和少量的胃酸返流入口腔导致酸味，甚至牙釉质损坏。

Because this surface is made up of many teeth, and the outer enamel layer of the tooth would wear down slower than the inner dentine layer, the teeth themselves, would wear down at an uneven rate.

因为这个表面由许多牙齿组成，而牙齿的外牙釉质层比内牙本质层磨损得慢，牙齿本身会以不均匀的速度磨损。