Read these sentences?
"The red door."
"The blind date."
"The mad dog."
I would pronounce these as "The reddoor." and the "blinddate". Sort of pausing in the middle of the d with tongue pressed against teeth. In a way this would be how a Swedish person would pronounce the word "reddoor". As in here.
But I have also heard people (mostly announcers of some kind) deliberately try to pronounce the D twice. As in "The redduhdoor." or "The Blinduhdate." or "The madduhdog". As in here at 0:30.
I just wondered for people teaching English or pronunciation, how do would you teach your students to pronounce these words. And is this codified anywhere such as a pronunciation guide?