  It is pointed that we now actually have no enough proofs to prove that time
reversal symmetry is universally obeyed in the processes of particle
interactions. The analyses show that the time reversal symmetry is obviously
violated at least in the decay processes of particles, especially in the decay
processes of strange particles, and some resonance states with only one middle
resonance particle to appear, as well as the annihilation processes of particle
pairs. So the phenomena of violating time reversal symmetry may exist commonly
in the interaction processes between particles.
