centring diphthong的用法和樣例：
例句
- The change of a simple vowel to a diphthong,often caused by the influence of neighboring consonants.
元音，割裂一個(gè)單元音向一個(gè)雙元音的轉變，常由臨近輔音影響所致。 - One day in the class I could not pronounce a diphthong - not opening my mouth wide enough - since I was from the Northeast, no matter how many times Teacher Zhang corrected me.
有一次，張老師糾正我的發(fā)音，說(shuō)我這個(gè)東北人，雙元音口形總是張不開(kāi)，一再嬌正也發(fā)不好。
