Polyprotonic acid
[化] 多元酸
🧩 词语组成解析
🗣️ 情景例句
to read to the students--their own children, really.
共同为学生们， 其实就是他们自己的孩子， 朗读
My cousin is a member of a stamp club, He seems stamp collecting.
我的表兄是一个集邮俱乐部成员，他似乎很喜欢集邮。
For them the working hours are never long enough.
对他们来说，工作时间总不会太长，