When I graduate, I often use the formula editor that comes with Word to write formula documents for papers. Sometimes typesetting problems cause my formula to be rewritten, and the follow-up procedure is very troublesome. Later, my friend recommended me to use the Billion Formula Editor, which can quickly save my written formula. Click on the keyboard space bar to insert what space bar? Remember to save the written formula as a picture or in the format you need. I'm glad I finished my paper before I handed it in right away. Yi Tu Formula Editor saves me a lot of trouble. So I suggest that you are also worth a try.