For the eye the light-sensitive surface is the retina.

对眼睛来说感光面是视网膜
For the camera it's the film.

对相机来说是胶片
They both have a focusing mechanism.

它们都有对焦功能
For the eye it's muscles

眼睛通过肌肉的伸缩
that change the shape of the lens.

来改变晶体的形状
For a camera it's a diaphragm that governs the amount of incoming light.

相机通过改变光圈的大小来控制曝光度
Even they're both encased in black.

它们甚至都有暗室
The light-sensitive part of the eye

眼睛和相机的感光部分
and part of the camera are both encased in black.

都被包在暗处
The difference is--So in fact,

区别在于事实上
the eye and a camera look a lot alike

眼睛和相机看上去非常像
and we know the camera is an artifact.

我们知道相机是人造品