Typically, it's silver halide crystals floating around in gelatin, which solidifies on the film.

有代表性地是悬浮在胶状体中的卤化银晶体，其最终固定在胶卷上。

But the basic idea is that they react with the remaining silver halide crystals to create an image you can see.

但基本思路都是与残留的卤化银晶体反应，生成可见的图案。

If more photons hit a silver halide crystal, more reactions with the developer can happen, and that spot on the film strip becomes darker.

更多光子撞击卤化银晶体，会引发更多显影剂反应，并且胶卷上的该点也会变得更暗。