Periaementitis
牙周膜炎
🗣️ 情景例句
Yes, but I don't know where to start.
是的 ，但我不知道从何说起。
It's a deal!
成交！
I can't understand why he is being so selfish. He isn't usually like that.
我不明白他此刻怎么这么自私。他平时不这样。