The solution of excess ingredients in hotels deduced by extensible mind mappingFuyu Ma, Rui Fan, Chongwen Huang, Bifeng Guo, Zihao Li, Qiubin Liu, Penghui Liu and Weitao HeITM Web Conf., 17 (2018) 03004DOI: https://doi.org/10.1051/itmconf/20181703004