求翻译：预分馏：切取合适沸程的重整原料。在多数情况下，进入重整装置的原料是原油常压塔顶＜180℃（生产高辛烷值汽油时）或＜130℃（生产轻芳烃时）汽油馏分。在预分馏塔，切去＜80℃或＜60℃的轻馏分。是什么意思？

Pre-fractionation: the appropriate boiling range cut re-engineering materials. In most cases, the raw material into the reforming unit is oil pressure tower <180 ℃ (the production of high octane gasoline) or <130 ℃ (when the production of light aromatics) gasoline fraction. In the pre-fraction

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Pre-fractionation: Cuts takes boils the regulation to rally raw material appropriately.When the most situations, enters rallies the installment raw material is the crude oil constant pressure tower goes against <180℃ (produces high octane value gasoline) or <130℃ (produces when light aromatic

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Distill in advance: Cut the reformation raw materials which pick up suitable to boil Cheng. Under at most situation,it is it crude oil atmosphere top of the tower <180 ℃(last alkane values hards high at the time of petrol) not to enter by raw materials fitted to reform or <130 ℃(while lasting