Pericemental gingivitis
[医] 牙骨质周龈炎
🧩 词语组成解析
[医] 牙周膜的
n. 齿龈炎
🗣️ 情景例句
You know something, Ellen?
知道一件事吗， Ellen？
Excuse me I don't know.
对不起我不知道。
She was offered a job as a translator, but she turned it down.
有人请她去作翻译，她拒绝了。