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orange splash liquid motion burst energy 活力 movement dynamic action speed velocity acceleration momentum force power strength impact collision explosion eruption outbreak release discharge emission radiation propagation transmission diffusion dispersion scattering reflection refraction diffraction interference polarization absorption emission luminescence fluorescence phosphorescence incandescence blackbody radiation thermal radiation synchrotron radiation cyclotron radiation bremsstrahlung annihilation radiation pair production nuclear fusion nuclear fission radioactive decay cosmic rays gamma rays X-rays ultraviolet rays visible light infrared rays microwaves radio waves