  We propose a novel SU(3)_c\times SU(2)_L\times SU(2)_R\times U(1)_{B-L}
left-right symmetric model where the standard model fermion and Higgs fields
are SU(2)_L doublets or SU(2) singlets while their mirror partners are SU(2)_R
doublets or SU(2) singlets. The scalar fields also include a real singlet for
dark matter and two SU(2) triplets for seesaw. The mixing between the standard
model and mirror fermions is forbidden by a Z_2\times Z'_2 discrete symmetry.
The mirror charged fermions can decay into their standard model partners with
the dark-matter scalar while the mirror neutrinos can decay into the mirror
charged fermions through the right-handed gauge interactions. Our model can
have new implications on the strong CP problem, leptogenesis, collider
phenomenology and dark matter detection.
