The stenographer uses a special keyboard, which is very expensive. There are only 24 keys in total. Press several fingers at the same time when typing, just like playing the piano.

It's pinyin, pure pinyin. But this has little to do with whether pinyin is good or not. Because learning speed recording is a hundred times more difficult than learning pinyin. In the later stage, it is conditioned reflex, and it is no longer a question of whether pinyin is good or not.