wide 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.
母音，割裂一個單母音向一個雙母音的轉變，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，張老師糾正我的發音，說我這個東北人，雙母音口形總是張不開，一再嬌正也發不好。
