当要被提纯的液体受热时, 它的蒸汽上升到分馏柱.As the solution to be purified is heated, its vapors rise to the fractionating column....

“分馏柱”的英语可以翻译为：still，dephlegmator，fractional column ...

“分馏柱”的拼音为：fēn liú zhù...