ACKNOWLEDGMENTS
This work was supported by grants from the National Natural Science
Foundation of China (31960280), Science and Technology Base and Talent
Special Project of Guangxi Province (AD20159042), Guangxi Natural
Science Foundation of China (No. 2018GXNSFAA294024), Guangxi
Universities Young and Middle-aged Teachers Scientific Research Basic
Ability Improvement Project (2019KY0055), and Key Research Program of
Guangxi Normal University (2017ZD009).