The stacked unit can be mounted on roll stand, universal colour unit or on similar units to make it 2 high, 3 high or 4 high configurations for multicolour printing on both sides.

层叠式机组可安装在卷纸架上，通用颜色设备或相似的设备之上，组成2个高塔、3个高塔或4个高塔，双面都可进行多色印刷。

youdao

Control of ambient temperature is particularly critical when one apparatus is stacked above another, because the heat generated from the lower unit can interfere with the operation of the units above.

当一个仪器堆积在另一个仪器上面时，由于下面较低部分产生的热量会干扰上部仪器的操作，在这个时候对于室温的控制就要求特别苛刻。

youdao

And he has been placed in charge of Kodak's second-biggest revenue generating unit, Health Imaging, where the cards are stacked for his success.

FORBES: Magazine Article