# 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. ![vowels-mouth-shape-ɒ-ɔ](/images/vowels-mouth-shape-ɒ-ɔ.svg) 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/`.