It is more formal to use student union in the paper.

Wording mistakes are common mistakes made by many writers. When we write scientific papers, we must avoid mistakes in words. Because in the field of scientific papers, even two words with similar meanings often combine different meanings, which leads to great changes in the meaning of sentences and even paragraphs, leads the correct research results to the wrong reporting direction, and makes an original excellent paper become a paper with obvious errors and defects, which naturally cannot be published smoothly.