However, vacuum column operations present an arduous environment for efficient fractionation, which makes upgrading product from bottoms to distillate more difficult.
然而，有效馏分的提取会使减压操作处境变得困难，也使塔底物料中蒸馏出更多的产品变得更加困难。
However, vacuum column operations present an arduous environment for efficient fractionation, which makes upgrading product from bottoms to distillate more difficult.
然而，有效馏分的提取会使减压操作处境变得困难，也使塔底物料中蒸馏出更多的产品变得更加困难。
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