1, the labels used should strictly conform to the theme of the article, the words should be concise and clear, and the number of words should not be too long, just two or three words.
2. Labels shall not use numbers, foreign languages or special symbols, as well as the arrangement of numbers, pure foreign languages, combinations of Chinese and foreign languages, traditional Chinese characters, etc. Should not be restricted, but the use method should be appropriate.
3. The meaning of the label should be accurate, and avoid ambiguous words.