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A multi-dimensional electron phase-space hole(electron hole)is considered to be unstable to the transverse instability.We perform two-dimensional(219)particle-in-cell(PIC)simulations to study the evolutions of electron holes in weakly magnetized plasma(Ωe < ωpe,where Ωe and ωpe are the electron gyrofrequency and plasma frequency,respectively),and the effects of perpendicular thermal velocities on the transverse instability are investigated.