There is actually no fixed answer to the question of how much is the appropriate repetition rate for undergraduates. The answer to this question can be influenced by a variety of factors, including but not limited to the topic, the field of research, the number of citations and references, and more. However, we can set a rough range for the repetition rate for undergraduates** to provide some guidance.
In general, the repetition rate of undergraduates** should be kept low, usually below 20. This is because the repetition rate reflects the proportion of original content in the **, and a lower repetition rate means more innovative and unique content. If the repetition rate of an undergraduate is too high, then it may be considered plagiarism or relying too much on existing research, which is usually not accepted.
However, this does not mean that a repetition rate of 0 is the best. When writing, it is necessary to cite the research and opinions of others appropriately, as this can make yours more convincing and enhance its scientific character. In addition, some conventional clichés and commonly used expressions are inevitably repeated, such as "The results of this experiment show ......and so on. These repetitions are usually allowed because they are necessary linguistic expressions.
Therefore, a reasonable repetition rate for undergraduates** should be between 10 and 20. This ensures that you have enough citations and references to support your argument without relying too much on other people's research. Of course, this is only an approximate range, and the specific repetition rate needs to be adjusted according to the specific situation of **.