It is common to read a book and gain a lot, but sometimes the reader may feel that the expected effect is not achieved. This could be due to a variety of factors such as: 1. Not enough reading time: It may take some time to truly understand and absorb a book. If you only read a few pages or a few days, you might not have enough time to digest it. 2. Wrong way of reading: Sometimes the reader may read too fast or too slowly or not read carefully. Reading requires concentration and careful reading of every paragraph and sentence. 3. Disinterest in the subject: If the reader is not interested in the subject of the book, it may be difficult to gain anything from it. Reading should be an interesting and challenging process that requires the reader to find and explore on their own. 4. The reading content is not deep enough: Some books may only cover the surface information and plot without delving into deeper topics and concepts. The reader may need to read more in depth to gain more. 5. Poor reading environment: Sometimes readers may read in an environment that is not suitable for reading, such as a noisy environment or when they are in a bad mood. These factors might affect the reading experience and effect. Reading was a personal process that required the reader to explore and discover on their own. If the readers feel that they have not gained enough, they can try to adjust the reading time, reading method, reading environment, and reading content to better enjoy reading.