Or a secret light that impressed the ghost onto the glass plate when it's coated with photosensitive chemicals inside this tank.

或者是一个秘密的光把鬼魂印在玻璃板上，其上涂了光敏化学物质。

He found a way to fix images by dipping paper into photosensitive chemicals and exposing it to light inside a camera obscura, which is essentially a dark room with a tiny hole in it.

他找到了一种修复图像的方法，将纸浸入感光化学物质中，然后将其暴露在暗箱内的光线下，暗箱本质上是一个暗室，里面有一个小洞。