Ang starts from a, then the root of the tongue presses on the soft palate, and the airflow comes out of the nasal cavity. Eng begins with e, then the root of the tongue retracts and air flows out of the nasal cavity.

An, en, in, un and ün consist of vowels and nasal suffixes. When the nasal coda is -n and the nasal coda is -n, the tip of the tongue should be pressed against the upper gum (upper gum), and the soft palate will droop, so that air can flow out of the nasal cavity.

Kou (kǒu), Chinese characters. Refers to the organs where people and animals eat and make sounds, and also refers to the places where containers pass outside, and also refers to the places where they enter and exit, such as doors. The word is in Guiguzi, "the door of the mouth." I mentioned it. To distinguish means to separate two different things. I hope you can tell the good from the bad.