The difference between the sound/v/f with//are the neck only, is that we need to add an echo at the time we throat vote compared with Allee echo music. If the time of the two songs ' Allee ' becomes the sound/v/.
The difference between the phonemes / f / and / v / the throats, one is we need to add echo the throat every time we vote, compared with the humming reverberation. If the humming sound 'F' becomes the sound / v /.
The difference between the phonemes / F / with / V / at the neck only we have to add the echo that ลำคอเวลา pronounced compared resonance to croon. If humming sound of 'time' will become the audio / V / .