This work was supported by the National Natural Science Foundation of China (11988101, 12203045, and 11725313), the Key Research Project of Zhejiang Laboratory (2021PE0AC03), and the National Key RD Program of China (2017YFA0402600). Yuan-Pei Yang is supported by the National Natural Science Foundation of China (12003028), the China Manned Spaced Project (CMS-CSST-2021-B11), and the National Key Research and Development Program of China (2022SKA0130101). Shi Dai is the recipient of an Australian Research Council Discovery Early Career Award (DE210101738) funded by the Australian Government. Pei Wang acknowledges support from the National Natural Science Foundation of China (U2031117), the Youth Innovation Promotion Association CAS (2021055), CAS Project for Young Scientists in Basic Reasearch (grant YSBR-006) and the Cultivation Project for FAST Scientific Payoff and Research Achievement of CAMS-CAS. This work made use of the data from FAST (Five-hundred-meter Aperture Spherical radio Telescope), a Chinese national mega-science facility, operated by National Astronomical Observatories, Chinese Academy of Sciences. We would like to thank Don Melrose for valuable discussions.