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西欧中世纪的骑士教育作为家庭教育形式，是普通人民的教育。
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Six of the back vowels are rounded lips.
How many back vowels are there in English? What are they?6, and they are /u:/, /u/, /ɔ:/, /ɔ/, /ɑ:/ and /ʌ/.
How can we subdivide the six back vowels?They can be subdivided into those that are high (/u:/ and /ʊ/), mid (/ɔ:/ and /ʌ/), and low (/ɑ:/ and /ɒ/)
实验中编码器供电电压是多少?( )
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