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We investigate the dynamical chiral symmetry breaking and its restoration atfinite density and temperature within the two-flavor Nambu-Jona-Lasinio model,and mainly focus on the critical behaviors near the critical end point (CEP)and tricritical point (TCP) of quantum chromodynamics. The multi-solutionregion of the Nambu and Wigner ones is determined in the phase diagram for themassive and massless current quark, respectively. We use the varioussusceptibilities to locate the CEP/TCP and then extract the critical exponentsnear them. Our calculations reveal that the various susceptibilities share thesame critical behaviors for the physical current quark mass, while they showdifferent features in the chiral limit.

Critical behaviors near the (tri-)critical end point of QCD within the NJL model