If you want to be perfect in doing something, the only way you can make it is to practice. By practicing, you will become more and more familiar with your work, and then you will become more and more skillful. A good example of this is the study of English. You can learn some words and grammar from books and teachers. But without practice, you can never use them freely. Moreover, you will even find it too difficult to remember them. The only way to solve this problem is to practice more. Another example is learning to swim. It is obvious that you can never swim if you dare not drop yourself into water. Swimming can only be learned through practice in water, which can make you get the feeling of water and make your motion correct and effective. Practice makes perfect. Only when you have practiced a lot can you achieve perfection. 这篇短文的篇章模式是哪一种?