Predentin
前期牙(本)质, 原牙质
🗣️ 情景例句
I have no idea about fashion there days, which is why I dress so plainly.
我对现在的时装潮流一窍不通，这就是我穿得这么普通的原因。
When does it arrive?
什么时候到那儿？
We'll take 500.
我们要500个