The offload system then pulls the sheet from the lay table to the printer's bed and the table vacuum is engaged to draw down the sheet.
然后卸载系统就会把板材从放置台放到打印机床上，然后打印真空台就可以吸附板材。
Switch on the vacuum to draw the solution through the column (The plasmid DNA binds to the column material).
开启真空装置使液体通过管柱（质体DNA会与管柱物质结合）。
One does not inhale the smoke, but if one gets very good at it, one does not even have to puff: the slight vacuum created in the mouth by nose breathing will draw the finest of puffs through the stem.
不需要将烟吸入，但若有人精于此道，都不必再次吸：鼻孔呼吸时在口腔内造成的小小的真空就足以将那缕轻烟吸回烟嘴。
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