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1000-hours/sounds-of-american-english/2.1.9-aɪ.md
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# 2.1.9. `aɪ, eɪ, ɔɪ, eə, ɪə, ʊə, aʊ, əʊ`
# 2.1.9. `aɪ, eɪ, ɔɪ, aʊ, əʊ, er, ɪr, ʊr`
亚洲语系基本上都没有和英文一样**长度**的**双元音**。韩文日文的母音和中文的韵母虽然都有少数由两个基础音素构成的组合音，但，它们和英文的双元音不同的地方在于，它们都是和其它韵母或者母音**等长**的，而不是像英文双元音的长度那样几乎是短元音的**两倍**。
@@ -12,23 +12,23 @@ For instance, when Chinese say *too tired* or "太累了," the syllable `tài` h
In English, diphthongs are a combination of two vowel sounds. They *glide* from the first vowel to the second, making them similar in length to long vowels. In terms of *rhythm*, you can think of them like a triplet in music, where three notes of equal length fit within one beat. The first sound tends to be slightly longer, while the second sound is a bit shorter.
读 `aɪ, eɪ, ɔɪ` 的时候，唇形分别从 `ɑ, e, ɔ` 开始，唇形保持不变，用喉咙完成从其实元音到 `ɪ` 的过度。
读 `aɪ, eɪ, ɔɪ` 的时候，唇形分别从 `ɑ, e, ɔ` 开始，唇形保持不变，用喉咙完成从起始元音到 `ɪ` 的过度。
When pronouncing the sounds `aɪ, eɪ, ɔɪ`, begin with the mouth shapes for `ɑ, e, ɔ` respectively. Keep lips in the same position and use throat to glide from the initial vowel sound to `ɪ`.
![vowels-mouth-shape-aɪ](/images/vowels-mouth-shape-aɪ.svg)
读 `eə, ɪə, ʊə` 的时候，也一样，唇形分别从 `e, ɪ, ʊ` 开始，唇形保持不变，用喉咙完成从其实元音到 `ə` 的过度。美音会儿化这个 `ə`，所以是 `eər, ɪər, ʊər`，或者干脆写成 `er, ɪr, ʊr`。
读 `er, ɪr, ʊr` 的时候，也一样，唇形分别从 `e, ɪ, ʊ` 开始，唇形保持不变，用喉咙完成从起始元音到 `ɚ` 的过度。美音会儿化这个 `ə`，所以是 `eɚ, ɪɚ, ʊɚ`，于是干脆写成 `er, ɪr, ʊr`。
When pronouncing `eə, ɪə, ʊə`, it's the same process. Start with the mouth shapes for `e, ɪ, ʊ`, keep lips steady, and use your throat to glide from the initial vowel to `ə`. Americans tend to *rhotacize* (add an `r` sound to) this `ə`, so it becomes `eər, ɪər, ʊər`. Alternatively, they are written as `er, ɪr, ʊr`.
When pronouncing `er, ɪr, ʊr`, it's the same process. Start with the mouth shapes for `e, ɪ, ʊ`, keep lips steady, and use your throat to glide from the initial vowel to rhotacized `ɚ`, so it becomes `eɚ, ɪɚ, ʊɚ`, which are written as `er, ɪr, ʊr`.
![vowels-mouth-shape-eə](/images/vowels-mouth-shape-eə.svg)
读 `aʊ, əʊ` 的时候，唇形有变化，要分别从 `ɑ, ə` 开始，而后过度到 `ʊ`。
读 `aʊ, oʊ` 的时候，唇形有变化，要分别从 `ɑ, ə` 开始，而后过度到 `ʊ`。
![vowels-mouth-shape-aʊ](/images/vowels-mouth-shape-aʊ.svg)
When pronouncing the sounds `aʊ, əʊ`, mouth shape should *change*. Start with the sounds `ɑ, ə` respectively, then glide towards the `ʊ` sound.
When pronouncing the sounds `aʊ, oʊ`, mouth shape should *change*. Start with the sounds `ɑ, ə` respectively, then glide towards the `ʊ` sound.
在读它们的时候，重要的是，要把它们读得**足够长** —— 几乎要占用两个元音的发声时长，并且足够饱满。