In Chinese papers, there is usually no need to add spaces between Chinese characters and letters. Because there is no need to add any symbols or spaces between Chinese characters and letters in Chinese writing norms. However, in some special cases, such as English words mixed with Chinese sentences in academic papers, in order to make English words clearer and easier to read, spaces can be added between English letters, such as "natural language processing". Explained in the vernacular, there is no fixed norm in the case of normal reading chinese articles mixed with Chinese and English. The explanation is simple and clear, and will not be misunderstood. At the same time, the explanation of the anomaly is given, which provides more knowledge for the respondents.