Pronunciation method of round yuán sound: the lips are slightly opened to both sides, the tip of the tongue is pressed against the lower gum, and the middle and rear part of the tongue is pressed against the soft palate, so that the whole tongue surface is in a relaxed state. At the same time, the vocal cords vibrate, making yuán sounds. The voice should keep a certain pitch, neither too high nor too low, and be in a relatively peaceful state.

Pronunciation method of pán sound: the lips are slightly open, the tip of the tongue presses the gums, and the middle and back of the tongue presses the soft palate to relax the whole tongue surface. Then let the air flow out of the mouth and make the sound of pá n, which requires the air flow and sound to be emitted at the same time. Pay attention to the intensity of airflow and the loudness of sound.

In the process of pronunciation, lips, tongue and throat need to work together. Lips need to control the shape of the mouth to let the air flow out of the mouth smoothly; The tongue needs flexible movement to control its position and shape; The throat needs to be relaxed to let the sound come out naturally. The pinyin pronunciation of CD needs to emit two syllables continuously, the first syllable is the initial consonant and the second syllable is the vowel.

Symbol of CD:

1, perfection and perfection: In many cultures, the disc is regarded as a symbol of perfection and perfection. This is because the circle is a geometric shape with no starting point and ending point, and there is no obvious defect or blank, so it is regarded as a symbol of completeness, perfection and perfection.

2. Peace and harmony: Another universal meaning of the disc is peace and harmony. In many cultures, the circle is regarded as a symbol of peace, friendship and harmony. This may be because the circle has no sharp corners or edges, and it is smooth and has no abrupt parts, so it is regarded as a symbol of peace and harmony.

3. Protection and safety: The disc is also considered as a symbol of protection and safety. In many cultures, a circle is regarded as a closed shape, which can form a protective boundary or shell to protect the objects or creatures inside it from external harm or threat. Therefore, the disc is also regarded as a symbol of protection and safety.

4. Infinity and eternity: Because the circle has no obvious starting point and ending point, it is considered as a symbol of eternity and infinity. In many cultures, the circle is used to represent the infinite cycle and continuity of time, space, universe or life.