How hard is it for a song to change its face?

It is extremely difficult for a song to change its face. According to the public information of the inquiry, you need to use a moderate proportion of voice when changing your face, and make a smooth and unimpeded voice through harmonious singing. Don't have too much prop glue, so that rabbits can't pull it down, or pull all the faces down at once. The action should be clean and neat, and the fake action should be clever, which can deceive the eyes of the audience. It is extremely difficult to achieve these three points.