Quadrivalence
n. 四价\\n[医] 四价
🗣️ 情景例句
Yes. The station's that way.
有。地铁站在那边。
This man digs foundations for skyscrapers.
这个人在挖着高层大楼的地基。
I've got some personal affairs that I have to see to, but I've also got some time to visit some relatives.
我还有些个人的事得去料理一下，但我也得抽些时间去看看一些亲戚。