Plicadentin
放射状牙质
🗣️ 情景例句
When Alexandra arrives,
等Alexandra到达时，
He's a very hard man to please.
他是一个很难讨好的人。
As Fred was going in the same direction, he walked along with the tourist.
因为游客与弗雷德走的是同一个方向，他便与游客一道同行。