Periodontoclasia
齿骨膜崩解
🔁 扩展释义
【医】 牙周溃坏
🗣️ 情景例句
How come you look so tired?
你怎么看起来这么疲倦？
John and I are old friends.
我和约翰是老朋友了。
It is six o'clock.In the evening, the children usually do their homework, but this evening, they are not doing their homework.
现在是6点钟。晚上，孩子们通常是做作业，而今天晚上，他们没做企业。