Pentavalency
五价
🗣️ 情景例句
She is at the top of her class.
她在班里名列前茅。
I'm thinking about a visit to Paris.
我在考虑去巴黎旅游。
He built a glass wall through which he could watch what went on inside.
他建造一堵玻璃墙，透过玻璃墙他能够观察里面发生的事情。