The wonderful pen was a figure of speech that was usually used to describe it. It refers to making the article more lively and interesting to make a deep impression on the readers. Although the wonderful pen was a rhetorical device, it could sometimes lead to misunderstandings or improper use. If you don't use it properly, the wonderful pen may become a wrong sentence, but this is not absolute. As long as you pay attention to the use of language and expression, you can still play the rhetorical effect of the wonderful pen.