Quadrivalence
n. 四价\\n[医] 四价
🗣️ 情景例句
Yes? May I help you?
什么事？我能为您效劳吗？
Do we really have the means to actually pull this off?
我们确实有办法把这事办成吗？
She was born in 1966.
她生于1963年。