Quadrivalence
n. 四价\\n[医] 四价
🗣️ 情景例句
I think we should leave the door open. it's boiling in there.
我觉得我们应该把大门敞着，屋里太热了。
Coming events cast their shadows before them.
山雨欲来风满楼。
Editors of newspapers and magazines often go to extremes to provide their reader with unimportant facts and statistics.
报刊杂志的编辑常常为了向读者提供成立一些关紧要的事实和统计数字而走向极端。