你怎能把图像投影?从图看起来你不能定位的三重透镜向前或向后倒退?

你怎能把图像投影?从图看起来你不能定位的三重透镜向前或向后倒退?的英文翻译

基本释义

• English: How can you focus the image projection? From the diagram it look like you can not move the position of the triple.