  An M-brane and anti-M-brane scheme is proposed to study nonextremal 4D and 5D
black holes. The improved nonextremal intersecting M-brane solutions proposed
here, involve two sets of harmonic functions. The constraints among the
pressures are found, and new features in the M-brane and anti-M-brane picture
are demonstrated, which resolve the discrepancy in the number of free
parameters in the D-brane picture. In terms of the ``numbers'' of M-branes and
anti-M-branes, the prefactors of the entropies are found to be model
independent, and the Bekenstein-Hawking entropy assumes the duality invariant
form which is consistent with the microscopic explanation of the black hole
entropy.

High Energy Physics - Theory;General Relativity and Quantum Cosmology