Perfluorination
[化] 全氟化; 全氟化作用
🗣️ 情景例句
Practice tenses as much as possible.
操练各种时态。
I'm sorry to keep on coughing.
我不停地咳嗽，真是抱歉。
You can see my father, my mother,and my brother, Jim.
你可以看到我的爸爸，我妈妈，和我的哥哥Jim。