There are horizontal lines on the cover of this paper. The appearance of horizontal lines on the cover of paper will affect the quality of paper. Horizontal lines are usually caused by printer failures, which may affect the overall beauty and formality of paper. Therefore, if there are horizontal lines on the cover of your paper, you can consider reprinting the cover or seeking other solutions. When printing paper, it is recommended to use high-quality printers and printing paper, and check whether the nozzle and ink cartridge of the printer are normal in advance. In addition, before printing, you need to preprocess the file, especially when using PDF files, you need to check whether there are pictures or words overlapping to avoid printing problems. In a word, the cover of the paper is a very important part. Pay attention to details when printing, try to reduce the possibility of horizontal lines and other problems, and ensure that the printed paper can meet academic requirements and leave a good impression.