... CASE OF ENGLISH VOWEL / / PRONOUNCED BY NON-ENGLISH-MAJOR STUDENTS IN BANKING ACADEMY (Nghiên cứu hiệu phương pháp sử dụng phần mềm luyện ngữ âm việc nâng cao khả phát âm sinh viên Điển cứu âm vị ... than English lies in the establishment of the qualitative oppositions / / - /e/ - / /- /c/ The opposition /e/ -/ / may be emphasized by making use of the length component of RP / / in certain contexts, ... differentiated from /a/ based on F2 values (/ /: 1660Hz; /a/: 1100Hz) because the F1 value of /a/ and / / is the same (F1: 700Hz) In other words, if the speaker produces a vowel with F2 value of 1100Hz,...