When you sing separately, your right hand keeps hitting, and you can't mess around. The left hand can beat the time with the right hand (the right hand beats inward and the left hand beats inward). ? If you can control your right hand evenly, then your left hand can make some gestures, such as dragging it up slowly from your waist, which means the sound changes from small to big. Put your left index finger on your lips (vertically) and make a gesture to show that others are villains, indicating that your voice is low or your strength is low. etc