1. The main stroke can be one or two strokes, or it can be the main part, such as the spring character, and the left and right strokes are the main strokes.
2. Not every word has a main pen. Some unique words, such as Japanese and China, can be considered as having no main pen.
3. The main pen is not static, and the things written are different. The main pen may be different, but when it is written, it has a soul and is the same.