Dear, it's too stingy if the dolphin sound is so low, so you can't judge it. The so-called screaming is that after being frightened, the muscles of the whole body tighten and unconsciously start from the abdomen to make the highest sound so far. (Dolphin sounds need special methods, so they are not included.) In fact, anyone can make sounds with his mouth closed, and there are various sounds. This sound doesn't mean anything. It's not that I want to say it, but if you really want to learn music, just let go of your voice. Don't be shy, you can't practice anything like that, and such a low voice doesn't mean anything. Who can hear your voice if you don't let go of it on the stage that attracts people's attention? In fact, you can know this if you ask a music teacher. If you still don't understand anything, you can contact me at any time.