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2.1.8. ɑː/ɔː
这一对元音在发声的时候，嘴唇动作非常明显，要在嘴唇形成一个小的圆形之后才开始发音。
When pronouncing this pair of vowels, the lip movement is very noticeable. It's important to form a small circle with lips before beginning to vocalize.
与英音的 ɒ 相比，美音的 ɑː 会嘴巴张得更大一点，读得更长一点，听起来更像 ɑ。比如，dog, 英音是 /dɒg/, 美音却是 /dɑːg/；而 God, 英音是 /gɒd/，美音同样相对更长一点，/gɑːd/。
Compared to British English, the American pronunciation of ɒ is slightly longer and sounds more like ɑ. For instance, for the word dog, in British English, it's pronounced as /dɒg/, while in American English, it's pronounced as /dɑːg/. Similarly, for God, it's /gɒd/ in British English, but in American English it's elongated to /gɑːd/.
另外，在重读音节里，ɔː 可能会被美国人儿化，读成 ɔː ，更像是双元音 ɔər。比如，more /mɔːr/。
Additionally, in stressed syllables, ɔː might be rhotacized by Americans to sound like ɔr, resembling the diphthong ɔər, for example, more /mɔːr/.