Perhalogeno-
[化] 全卤(代)(代替所有C上的氢)
🗣️ 情景例句
His studies advanced steadily.
他的学业不断进步。
How many provinces do you have?
你们有多少个区？
But this was before Annie Sullivan came to stay.
但是，这都是安妮·莎利文来住下之前的事了。