音标元音到底是20还是28个?都有哪些

20个
[æ] bag cat jam
[e] bed desk get
[i:] even fever he
[i] big fish gift
[ɑ:] arm car dark
[ʌ] come some money
[ə:] burn church hurt
[ə] garden open silent
[ɔ:] for horse north
[ɔ] box cock dog
[u:] boot food moon
[u] book cook foot
[ai]bike nine shine
[ei] cake date face
[əu] go no code
[uə] assure insure sure
[ɛə] chair fair hair
[ɑu] about cloud found
[ɔi] boil choice coin
[iə] hear dear nea

元音音标表（20个）5个元音的字母音 a [ei] e [i:] i [ai] o [əu] u [u:]5个元音的短元音：a [əe] bag cat hat mape [e] pen bed ten henI [i] big pig sit hillo [כ] box hot dog f...

20