"Enamel" glass, in bars, rods and tubes, unworked.
“搪瓷”玻璃，呈棒状、条状和管状，未加工。
The enamel layer of a tooth is made up of hydroxyapatite crystals, which form microscopic "rods".
牙齿最外层的牙釉质是由我们肉眼看不到的显微小管所组成的。
The enamel layer of a tooth is made up of hydroxyapatite crystals, which form microscopic "rods".
牙齿最外层的牙釉质是由我们肉眼看不到的显微小管所组成的。
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