Boeing is a decorative sound, which is used to modify the pitch other than the original sound. It is usually played in a fast and smooth way. When using Boeing, you need to play at a certain speed and rhythm. The specific usage methods are as follows:

1. First, determine the local sound and the pitch to be modified.

2. Determine an appropriate pitch above or below the local sound as the starting point of Boeing.

3. Wave upward or downward from the starting point at an appropriate speed and rhythm to form a wavy line.

4. In the process of fluctuation, some decorative sounds or changing sounds can be added appropriately to enrich Boeing.

5. Finally, return to the local sound to end the performance.

When you sing the Boeing, you can adjust the speed and rhythm appropriately according to the specific situation, and add decorative sounds and inflection sounds to form different musical effects. Generally speaking, the performance of Boeing requires certain skills and experience. It is suggested that you listen more and practice more during practice and gradually master the skills.