i have some questions about pronunciation of English. pls help me! thank u very much! i am not very sure how to pronounce /p/,/t/,when they beside these letters"o,a,i,e,u"-----the vowel letters.if it should pronounce /b/ and /d/?if, the answer is "yes", pls tell me y the dictionary do not print /b/and /d/ to instead of the two? for instance, stop , open, stock, spend...(i always pronounce these tow /b/ and /d/) 我对英语里面/p/ , /t/这2个发音一直存在着困惑,不是很清楚到底是不是分别发/b/和/d/的音,听录音里边似乎是发/b/和/d/,但似乎也有例外的比如open这个单词,这里的p好像就发/p/.但我还是比较习惯发/b/ hope you can help me! thank u in advance!