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use a projector to do sth
表达“用投影仪做某事”时，可用 use a projector to do sth 结构。
The lecturer used a projector to display the charts.
讲师用投影仪展示图表。
投影仪；放映机
先理解核心含义，再看它在真实句子里的用法。
投影仪；放映机
an optical device for projecting a beam of light
The lecturer used a projector to display the charts.
讲师用投影仪展示图表。
设计或提出项目的人；提议者或策划者。
Someone who devises or suggests a project; a proposer or planner of something.
用于投射光束的光学设备
an optical device for projecting a beam of light
投影仪；光学投影设备,尤指将图像或动态影像投射到屏幕上的设备
An optical device that projects a beam of light, especially one used to project an image (or moving images) onto a screen.
将放大图像投射到屏幕上的光学仪器
an optical instrument that projects an enlarged image onto a screen
The teacher switched on the projector to show the class a map of the world.
老师打开投影仪，给全班展示一张世界地图。
Could you move the projector closer to the wall so the image is larger?
你能把投影仪挪得离墙近一些，让画面更大吗？
The meeting room has a new projector that connects wirelessly to laptops.
会议室有一台新的投影仪，可以无线连接笔记本电脑。
表达“用投影仪做某事”时，可用 use a projector to do sth 结构。
The lecturer used a projector to display the charts.
讲师用投影仪展示图表。
turn on/off 是表示开关设备的常用短语动词。
Could you turn on the projector for the meeting?
你能不能为会议打开投影仪？
表示“把……连接到投影仪”用 connect A to B 结构。
Connect your tablet to the projector before the talk.
演讲前把你的平板电脑连接到投影仪。
Not this
There are three projector in the room.
Use this
There are three projectors in the room.
projector 是可数名词，复数形式为 projectors。中文名词没有复数变化，所以学习者容易漏掉 -s；指多个投影仪时必须在名词后加 -s。
Not this
Please look at the projector.
Use this
Please look at the screen.
projector 指投影仪这个设备，不是显示画面或屏幕。想表达“看屏幕上的内容”时应用 screen；把“投影仪”当作“屏幕”是中式英语的常见误用。
Not this
The projector is blurry.
Use this
The projection is blurry.
projector 指投影设备本身，projection 指投出的图像。描述画面模糊时应用 projection 或 picture，而不是 projector。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
高射投影仪
The teacher used an overhead projector in class.
老师上课时使用了高射投影仪。
数字投影仪
We bought a digital projector for movie nights.
我们买了一台数字投影仪用于电影之夜。
投影屏幕
Please lower the projector screen for the presentation.
请放下投影屏幕准备演示。
投影仪镜头
Clean the projector lens to get a sharper image.
清洁投影仪镜头以获得更清晰的图像。
视频投影仪
The conference room has a high-definition video projector.
会议室配备了一台高清视频投影仪。
Use projector naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 pro 想成“向前”，ject 想成“投”，投影仪就是把画面向前投到屏幕上的机器。
语域：neutral 常见场景：conference rooms、classrooms、home theaters projector 指投影仪/放映机时，属于中性常用词，正式场合与日常口语中都比较常见；多用于会议、教学、家庭影音放映等场景，没有明显的语域限制。
这些词的重音都在第二个音节的 /ɛkt/ 上，与 projector /prəˈdʒɛktɚ/ 押韵，且都含 -ector 拼写。注意拼写相似的 project（名词 /ˈprɒdʒɛkt/，动词 /prəˈdʒɛkt/）和 projection /prəˈdʒɛkʃən/ 读音不同，不押韵。
Dictionary facts from ECDICT, WIKTIONARY.