The spelling of dtnl and single vowel

The spelling of DTNL and single vowel is as follows:

When D is pronounced, the tip of the tongue touches the upper gum to block the airflow, and then the tip of the tongue suddenly leaves, spitting out a weak airflow, and the vocal cords do not vibrate.

when pronouncing t, the pronunciation position and method are basically the same as that of d, but the difference is that the airflow sent by the mouth is stronger.

When N is pronounced, the tip of the tongue touches the upper gum, blocking the airflow, allowing the airflow to come out of the nasal cavity, and the vocal cords vibrate.

when l is pronounced, the tip of the tongue is pressed against the upper gingiva, which is not full, so that air flows out from both sides of the tongue and the vocal cords vibrate.

d, t, n and l are all sounds formed by the tip of the tongue touching the upper gingiva, which are called tip of the tongue sounds.

When spelling with single vowels, you need to spell with tones. For example, n-ù→ nù is angry "anger" and l-ù→ lù is the "road" of the road; N-ǚ→ N-ǚ is the "female" of female students, and L -ǚ→ L-ǚ is the "brigade" of tourism.