Pma.
[医] 龈炎发病率(P为乳头,M为龈缘,A为龈附丽)
🗣️ 情景例句
What's the best way to learn English?
学习英语最好的方法是什么？
My brother is two years younger than I am.
我的兄弟比我年轻2年。
If a shop assistant told him she had not heard of it, he would pretend to be considerably put out.
要是女售货员告诉他从未听说过这些东西，他会装出十分遗憾和不安的样子。