Quadravalence
四價
??? 情景例句
Hello, it's good to see you again.
很高興又見到你。
We are thinking of placing an order for your Flying Pigeon Brand bicycles. We would be very grateful if you could make us an offer for 200 ones with details.
我們正打算訂購你方的飛鴿牌自行車。如果你們能給我們（購買200臺的詳細報盤將不勝感激。
He acted as if he had never lived in England before.
他的舉動就好像他從未在英國生活過一樣。