中国大学MOOC: How can you distinguish between front vowels, central vowels, and back vowels?
举一反三
- 中国大学MOOC: Pure vowels can be classified into three categories: front vowels, central vowels and back vowels. The two vowels/ɜː/ and /ə/ are classified into ______ vowels because they are made with the middle part of the tongue being raised.
- 中国大学MOOC: There are two central vowels in English. What are they?
- 中国大学MOOC: In the following vowels, are back vowels.
- According to the part of the tongue which is raised, vowels can be divided into the following kinds: front, middle, central, back.
- 中国大学MOOC:" In the following groups of vowels, are not all front vowels.";