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though I spent a lot of time, I still can't understand the meaning, here for help~

An English prononciation video, I saw, is to explain the
different between ah sound and aa sound, the text is :

-Also, ah, aa, do you see the difference in the tongue?
Ah, aa.
It's more present on the 'aa'.
On the 'ah' as in 'father' it is very relaxed,
ah, resting on the bottom of the mouth.
-
I just wonder what 's the meaning of "it's more present on the "aa", "present" here means what?!
I listened to the video for N times, the speaker in video exactlly said "present".

thanks a lot for your help.