  In this work, we examine the entropy emission property of black holes. When
the greybody factor is considered, it is found that Schwarzschild black hole is
a one-dimensional entropy emitter, which is independent of the spacetime
dimension and the spin of the emitted quanta. However, when generalized to
other black holes with two or more parameters, the result shows that the
one-dimensional entropy emission property will be violated. Thus our result
implies that not all black holes behave as one-dimensional entropy emitters.
