What does the "wedge" at the beginning of the novel mean?

The " wedge " at the beginning of a novel usually referred to a literary form, also known as " parenthesis." In a novel, a wedge is a special element used to introduce a new plot or character. It usually appears at the beginning of the novel to guide the reader into the story world. A wedge could be any form of content. It could be a paragraph of description, an event, a character introduction, or even a conversation. It was usually used to make the reader interested and want to continue reading. The wedge can be original or added to an existing novel, but it usually needs to be closely related to the novel's theme and plot to make it fascinating. In the novel Journey to the West, Wedge was the story of Sun Wukong who was rescued by the Dragon King on his way to the Western Paradise to obtain scriptures. This story not only paved the way for the subsequent plot development, but also showed Sun Wukong's wit and courage.