Predentin
前期牙(本)质, 原牙质
🗣️ 情景例句
Hi, there!
你好！
Bill was very jumpy as he waited for the phone to ring.
贝尔忐忑不安地等着电话来。
A piece of cheese.A loaf of bread.A bar of soap.
一块乳酪、一块面包、一块肥皂、