I hear lots of people pronounce this is underdog because of course I have lots of students who may be studied Morvan, American, English, British, English, We make lots of round shapes with the mouth on this op sound, which is, in a word, like not hot.
我聽到很多人念這個是弱音,因為當然我有很多學生可能是學過摩爾文的,美式的,英式的,英式的,英式的,我們在這個op音上用嘴做了很多圓形的形狀,總之就是像不熱。