投影仪聚焦

projection rooms───放映室，放映间

projectors───n.放映机（projector复数）；幻灯机投影机

projection booths───放映室；电影院中放置放映机的隔音小间

projection booth───放映室；电影院中放置放映机的隔音小间

protection factors───防护系数；防护因数

major focus───主要关注点

prime focus───[光][天]主焦点

He adjusted the slide projector to focus the image.───他调整了投影仪使图像清晰。

most research group focus on how to calibrate the multi-projector display precisely on planar screen or simple cylinder screen.───大多数的相关研究工作主要关注于如何在平面或简单曲面进行多投影的几何校正与颜色校正。

projector lens improves the light utilization (make it more focus) and solves the problem of astigmatism.───透镜提升光源使用率（更加聚光），解决散光问题；