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tokens: We thank the anonymous referee very much for a careful reading of the manuscript and constructive comments. The authors thank Professor Ke-Jun Li for his constructive ideas and helpful suggestions on the manuscript. This work utilizes the radio flux data obtained through the Solar Radio Monitoring Programme, managed by the Dominion Radio Astrophysical Observatory, Penticton, British Columbia, Canada. The data used here were downloaded from the web site of NOAA and the authors express their deep thanks to the staff of the web site. The wavelet software was provided by C. Torrence and G. Compo. It is available at: http://paos.colorado.edu/research/wavelets/ . This work is funded by the National Natural Science Foundation of China (11573065, 11673061, and 11633008), the Applied Basic Research Foundation of Yunnan Province, China (Grant No. 2014FB190), the Collaborating Research Program of CAS Key Laboratory of Solar Activity (KLSA201613), the Specialized Research Fund for State Key Laboratories, Center for Astronomical Mega-Science, and the Chinese Academy of Sciences.