久久国产欧美日韩精品,日韩国产精品久久久久久亚洲,99视频精品全部免费免费,91精品国产综合久久走光

n.雙元音( diphthong的名詞復(fù)數(shù) )...

diphthongs的音標(biāo)：...

And then you slur by dropping initial letters and diphthongs.'有時(shí)你又把單詞開頭的輔音和雙元音含糊掉.Diphthongs are complex ions of vowels.雙元音是元音的組合....