It is reasonable to submit more than one manuscript. My opinion is to publicize it everywhere, that is, to send it again. In the era when scientific research was just a personal hobby, there was no such concept at all. It doesn't matter how much hair you have. At that time, the paper format was more casual than now, and many articles were very narrative. You had to read them from beginning to end to know where some information was mentioned. After scientific research has become a formal profession (that is, a rice bowl), it has become a taboo to invest more than one manuscript. Because it is a career, the organizational system should be evaluated and there should be assessment standards. At this time, it will be very different to publish one more article than one less article, and the so-called "impact factor" will also appear in this case. Therefore, for the sake of fairness or convenience, it is necessary to prohibit multiple submissions of one manuscript. In this way, a simple number of articles can explain the problem. If more than one manuscript is allowed, the number of published articles does not explain the problem.