diphthong
n
union of two vowel sounds or vowel letters, eg the sounds in pipe , the letters ou in doubt 二合元音, 復合元音, 雙元音(如pipe 中的 音); 復合元音字母(如doubt中的ou). Cf 參看 monophthong.
??? 情景例句
Is the tip included in the bill?
賬單里包括小費嗎?
Skill and confidence are an unconquered army.
技能和信心是不可克服的軍隊。
After entering the narrow gap on the plateau, they climbed down the steep sides of the cave until they came to narrow corridor.