Necrotic gingivitis
[医] 坏死性龈炎
🧩 词语组成解析
a. 坏死的, 枯斑的\\n[医] 坏死的
n. 齿龈炎
🗣️ 情景例句
She is giving me piano lessons in exchange for her English classes.
我教她英语，她教我弹钢琴。
Please come here.
请来这里。
It was my first flight. I was nervous when the plane took off.
我第一次坐飞机，起飞时我有点紧张。