这个是中元音,英语中有三个中元音:
1. [ʌ] 如: cup,come, enough blood
2. [ə:] / [ɜ:] 如: her turn bird heard
3. [ə] 如: about observe sister gentlemen
而前元音有四个,分别是:
1. [i:] 如 see he eat key
2. [ɪ]/[i] 如 lily quick sit behind
3. [e] 如 bed get many dead
4. [æ] 如 map [mæp], dad, hat, chat