Predentin
前期牙(本)质, 原牙质
🗣️ 情景例句
I feel sorry for the beggars, but I can't stand it when they teach their children how to beg.
我很同情乞丐，但我真的看不惯他们教孩子怎么样行乞。
Lightly come, lightly go.
易得易失。
Li Lei.
李磊。