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tokens: We thank Professors M-D Ding, H-M Wang, and Y-N Su for very helpful discussions. This work is supported by NSFC grants 11790304 (11790300), 11125314, 11773016, and 11533005, No. U1531247 and 41574166, the Recruitment Program of Global Experts of China, the Key Laboratory for Modern Astronomy and Astrophysics (Nanjing University), and the Max Planck Partner Group program. H.T. thanks ISSI and ISSI-BJ for the support to the team “Diagnosing heating mechanisms in solar flares through spectroscopic observations of flare ribbons.”