Provide background information at the beginning of the introduction. Readers should prepare the detailed information they will see later, so that the first few sentences will be more general. ?

2. Introduce the clear theme of your research and explain its importance. As can be seen from the above example, the author began to talk about a clear research topic. Then, you can introduce some statistics to illustrate the importance of this topic or the seriousness of the problem.

3. mention that you tried to solve or answer this research question in the past. As mentioned above, there is no room for formal literature review in the introduction of a research paper, but you can point out the previous related research and explain how your research is different from the past. The difference may be simple. You can repeat the same experiment, but use different organic substances, or use larger and more diverse samples, plus use more advanced analytical equipment for detailed research, or adopt very different regional settings.

4. ending with a clear research goal, the above paragraphs naturally bring out a clear research goal.