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。
2
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）。
3
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.