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We comment on the conclusion by Teng et al. [J. Phys. D: Appl. Phys. {\bf42}, 135111 (2009)] that the Bir-Aronov-Pikus mechanism is more important thanthe D'yakonov-Perel' mechanism at high carrier density in intrinsic bulk GaAs.We point out that the spin relaxation is solely from the D'yakonov-Perel'mechanism.

Comment on "Density dependence of electron-spin polarization and relaxation in intrinsic GaAs at room temperature"