This is a fractionating tower.这是一座分馏塔.As the solution to be purified is heated, its vapors rise to the fractionating column.当要被提纯的液体受热时, 它的蒸汽上升到分馏柱.The utility model relates to a continuous thin film evaporation device p...
I felt loath to sully the gleaming brass knocker by handling it.我不愿意伸手去抓那闪亮的黄铜门环,怕把它弄脏。Number 30 has a red door and a brass knocker.30号有一扇红门和一幅铜门环.The knocker is oblong in shape, and of the kind our ancestors called " ja...