1, gargle and wash your hands;

2. Use any two fingertips of your hand and finger (choose the two that are convenient for you according to your personal habits) to approach and keep a distance of about one centimeter (just because of people);

3; The mouth is slightly open, and the tip of the tongue is against the inner side of the lower tooth;

4. Put two fingers together in your mouth and put them in front of your tongue, and gently squeeze them with your upper and lower lips;

5, air flow directly from the abdominal cavity to the throat, blowing out from the gap between two fingers, you can make a sound.

You don't have to follow the above steps, because it's just a person. As long as you can make a sound, you are half successful.