Time flies when students are in class (except for playing mobile phones and reading novels because they have already tried) This sentence came from a novel,"Battle Through the Heavens". It meant that time would pass very quickly during class. Other than playing with mobile phones or reading novels, it was not recommended for students to do other activities during class because it would distract their attention and affect their learning results. It should be noted that everyone's situation is different. Some people may think that playing mobile phones or reading novels during class will not distract them, but for some people, this method will waste time and affect the learning effect. Therefore, during class, you should concentrate on listening carefully and actively participate in classroom activities so that you can better grasp the knowledge.