Journal of Capital Normal University (Natural Science Edition)  is an open access journal sponsored by Capital Normal University. All submissions are free of review and layout fees. All published papers can be permanently obtained for free on the website. The licensing method is the Creative Commons Attribution Non Commercial Use No Deduction 4.0 Agreement (CC BY-NC-ND 4.0), which allows third parties to copy, distribute, exhibit, perform, screen, broadcast or disseminate articles published in this journal to the public through information networks, but the author’s name must be retained during these processes, limited to non-commercial purposes, and no derivative creations are allowed. For details, please visit https: //creativecommons.org/licenses/by-nc-nd/4.0/.