投影幕的英文：
translucent screen
adj. 半透明的；透亮的
A thin,strong,translucent paper.
葱皮纸一种薄而拉力强的透明纸张
The transmission of light through a translucent material.
漫射光在半透明材料中透射
The translucent border framing a television picture tube and screen.
电视显像管和荧屏的半透明边框
Interpose a translucent body between a source of light and the eye
将半透明体放在光源与眼睛之间
A small difference between them will render the composite translucent
微小的差别，也会使复合材料变成半透明。
n. 屏幕；纱窗；掩护物；庇护；电影；隔墙；装饰性围屏；挡风玻璃
v. 遮蔽；放映（电影）；审查；庇护；调查；隔挡；筛分；给…装上窗帘；拍电影
screening permit
放映许可证
Screening instrument can flash slides on a screen.
放映仪可以在荧幕上放幻灯片。
apparent screen image size
表观放映画面
medium appearing screen image
中等表观放映画面
The curtains screen out the sunlight.
窗帘遮住了阳光。