So what did we learn from these two examples? First impulsive/gradual nature? Not sure whether impulsive or gradual categies, but in these cases we inferred injection time and trapping time. So how about taking the ratio between trap vs. inj><2 as a criterion. Concerning the injection properties: as usual there are of cases of conveneint isotropic pitch angle distribution and time-constant energy. But there seems to be other cases like anisotropic injection momentum distribution or time-dependent spectrum are indeed needed in order to explain the spectral observations. And this result may be interesting for study of acceleration mechanisms. If you ask how was the pitch angle diffusion going?, I can simply answer it was weak diffusion in one case and strong in another. But in both cases trapping was rather good, but because of diffusion efficiency but because of either density or magnetic field inhomogeneity. For precipitation-usually talked about is secondary-escape from once-trapped population.  What is the role of magnetic fields in the flare? At least they guide the electrons, charged particles.   This is known and may be called passive roles. What’s the active role in the flare process? I mean, magnetic energy release via reconnection. This is a difficult question because it is in the regime of MHD, not plasma physics that helps radio and electron dynamics. But we try some