一架投影仪从店内向窗玻璃上投射出影像，安在玻璃上的一层薄薄的触摸板使触摸屏得以运转。
A projector beams the images onto the window pane from the inside of the shop, while a thin touch foil mounted on the glass powers the touch screen.
要用三脚架，或把相机靠在栏杆上，使相机稳定。
使插块灵活可靠地伸出到导轨架标准节角钢上，并能可靠缩回。
Make the inserting block stretch out to the Angle steel of guiding track framework, and can draw back reliably.
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