1. The team tried projecting the maps with two different projectors onto the same screen. 该组尝试用两台不同的放映机将地图投映在同一屏幕上。
2. I think I read somewhere that they used music to drown out the sound of the film projectors? 我想我在哪里读到过，他们是用音乐的声音来掩盖电影放映机的声音，是吗？
3. Even if that were the case, noisy projectors were separated from the main house pretty quickly, yet music continued to accompany film. 即使是这样，充满噪声的放映机很快就退出了主流，而音乐继续为电影伴奏。
4. He refused to develop projection technology, reasoning that if he made and sold projectors, then exhibitors would purchase only one machine—a projector—from him instead of several. 他拒绝研发投影技术，理由是：如果他研发并且销售放映机，电影放映者们就只会从他那里买一台机器，而不是几台。
5. How many projectors are in the room? 在房间里有多少台投影仪？
