E-books are becoming more and more popular among contemporary young people. It is understandable that they are busy with everything and cannot do without mobile phones. Of course, paper books should be a good choice in my spare time. In my personal experience, reading a paper book is always more intimate than reading a mobile phone screen, and it seems that I can understand the feelings between the lines better. From the traditional point of view, it is more worth reading paper books. Regarding health, staring at the mobile phone screen for a long time is definitely not good for your health. To sum up, I personally think it's understandable to use mobile phones to read books when I'm busy. Of course, paper books are the best when I have time.