Diphthongization
n. [语]二合双元音化,复元音化
🗣️ 情景例句
He accepted an offer of help.
他接受了援助的建议。
Why are you so happy?
你为什么这样快乐？
Don't crowd round him, said the gate keeper.
“不要围着他，”学校门卫说。