问答题

There are six back vowels in English. The back vowels are produced by shifting the body of the tongue back from its central position. The tip of the tongue remains at the level of the lower teeth.

答案：是的，英语中有六个后元音。后元音是通过将舌头体部从其中央位置向后移动来产生的。舌尖保持在下牙齿的水平位置。这些后元音通常...

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