I chipped the enamel on my front tooth when I fell over.
我跌倒时门牙
质碰碎了。
I chipped the enamel on my front tooth when I fell over.
我跌倒时门牙质碰碎了。
The additional enamel (much harder than the dentin in tooth interiors) makes hypsodont teeth more wear-resistant than low-crowned teeth are.
这些额外质（
其内部牙质硬很多）使高冠齿低冠齿耐磨得多。
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