How to pronounce bubble sound? What's the use of practicing?

Bubble sound refers to the lowest pitch sound emitted by vocal cords. Under the minimum breathing pressure, the vocal cords make a sound similar to that when a motorcycle starts, which is a bit like burping. Its sound effect is very similar to the starting sound of a motorcycle, and it is an introductory method of popular singing.

Practicing bubble sound is actually to find the position of * * * sound better, so that the sound will have a concentrated point, which will sound stronger and more like the real sound. It is very important to practice this in folk song singing, because the beginning of folk songs is generally very high, and the high notes need to stretch the vibrato. If there is no vibrato, it will sound unprofessional, and there are too many falsetto components in national singing, so when singing a song with great atmosphere, it will lose its vitality.