明明只有兩個眼睛，夜視儀為啥要裝4個鏡頭，多余兩個給誰用？

Why is a night vision device equipped with four lenses when it only has two eyes? Who can use the extra two?

#科学 #物理 #脑洞 #实验 #趣闻 #知识分享官 #科学科普 #知识 #科普 #生活百科 #知识科普 #Science #physics #brain hole #experiment #anecdote #knowledge sharing officer #science popularization #knowledge #Life Encyclopedia #knowledge popularization #Institute of all things