It is difficult to publish any kind of core, and the difficulty often depends on your subject rather than your academic ability. Because the selection criteria of the core directory are completely dependent on the data. In other words, the more articles in a journal are cited, the more it will be judged as a core journal. The unfair consequence of this is that for some purely liberal arts papers with weak timeliness, editors are increasingly reluctant to publish such papers because they do not need cross-references, which in turn leads to a decline in the overall publishing ratio of papers in this discipline. So there was a vicious circle. It is not easy to write core journal papers well, which requires the author to do relevant research and experiments, and to have high scientific research ability and theoretical research ability.