本帖最后由 annieyang 于 2010-10-15 23:41 编辑 4 v3 u$ {4 Z7 K4 y; F5 L
: w# {# n" t5 V# m) i 1#suvescape 8 h" P, U" r/ e, l"au" vs "o" 4 Y- n$ n; m& A; V. @
the former sounds more like /凹:/ , as also in "dog, boy, oil"4 C* W+ O+ k5 o2 w: G2 _9 W
the latter is close to"啊", as in "hot, non, on, not, cotton......" 0 V/ B' y, u6 ]& ybut when o+r, it just sounds like /凹:儿/
Not only does American Accent Training have such comment, other pronunciation books also suggest learners to treat these two as the same. The difference is more pronounced in British English, but one may be safe to ignore it when learning a North American accent, as most areas treat them almost the same. In fact, in our August 2010 accent reduction class, I taught the students to treat these two vowel sounds as the same, making it easier for our students.