  The pseudorapidity distributions of charged particles produced in p-Pb
collisions and Xe-Xe collisions at LHC energies are described by the revised
Landau hydrodynamic model. The research results are in agreement with the
experimental data measured by ALICE collaboration at LHC. The related
parameters are obtained and analyzed. And, we extracted the values of the
squared speed of sound for central source are between 0.4 and 0.5.
