The two dimensional pseudohomogeneous model was often used for the non isothermal, non adiabatic fixed bed reactor that was widely used for the strongly exothermic reactions.

绝热固定床反应器广泛应用于强放热反应体系。

It is an established convention to speak of the fixed stars as a standard unaccelerated reference frame .

把固定星说成是标准参照系，这是一种已经确立习惯。