english vowels,longvowels

7商务英语english vowels商务英语.pdf 13页
there are 20 english vowels.
unit 6 english vowels: back vowels / :/ / 05 / /u:/ /u/ / 00
the acquisition of english vowels reflected in taiwanese efl
pdf(36页) long vowels posters.pdf(98页) long vowels tracers.