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tokens: We appreciate Richard N. Manchester, Hao Tong, Shi Dai, Jumei Yao, Wenjun Huang, and Qihui Chen for helpful discussions. This work is supported by National Natural Science Foundation of China (Nos. 11178001, 11573008, U1631106). Hongguang Wang is supported by the 2018 Project of Xinjiang Uygur Autonomous Region of China for Flexibly Fetching in Upscale Talents. Yanrong Zhang appreciates Guangzhou University–University of Padova Joint PhD Program. The Parkes radio telescope is part of the Australia Telescope National Facility which is funded by the Australian Government for operation as a National Facility managed by CSIRO. This paper includes archived data obtained through the Australia Telescope Online Archive and the CSIRO Data Access Portal ( http://data.csiro.au ). We appreciate the anonymous referee for thorough and valuable comments. We thank Richard N. Manchester, Hao Tong, Shi Dai, Jumei Yao, Wenjun Huang, and Qihui Chen for helpful discussions.