How to judge the difference between speech and abdominal speech?

Speaking with voice, to put it bluntly, is not to make good use of the vocal cavity, but to use the vibration of the vocal cords themselves to make sound. Speaking with the abdomen actually solves two problems through the abdomen. First, using breath to impact vocal cords is louder than just using muscles in the throat, which is called breath support; Second, through the opening of the abdominal cavity, the diaphragm of the chest cavity is downward, thus increasing the space of the chest cavity and forming a good chest cavity. Just like a guitar, the strings are your vocal cords and the chest is the speaker. Without a speaker, sound can't be made. In addition, singing with your voice can easily cause tension in your throat muscles. After a long time, it will lead to congestion and edema, which will seriously affect the sound quality, and in extreme cases, it will lead to voice loss.