In the multimedia room there is an expandable shelf with a projector sliding down from the ceiling and a movable projection screen right by the window acting also as a sun blind.

在多媒体室有可扩展的架子，带有从天花板滑下的投影，还有可移动投影屏，正好在窗户旁也能充当窗帘。

youdao

This is in stark contrast to existing technology which requires the projector to be placed much further away - usually with the help of a large stand or ceiling installation.

BBC: CES 2013: Enormous TVs clamour for attention