It all starts with how we perceive brightness.

这一切都源于我们如何看待光线。

The doctor says your eyes can't be exposed to any light.

说你的眼睛不能暴露在光线下。

A large retina collects more light, more visual information.

巨大的视网膜能收集更多的光线和视觉信息。

If anything, try to expose yourself to warm, dim light before bed.

如果有可能的话，尽量让自己在睡前处于暖和暗色调光线之下。

To paint not objects in light, but the light itself.

他们不描绘光线中的物体 而是光线本身。

And that red light is just scattered light in the camera optics.

那条红色的光线只是机的 光学部件散射出的光。

Far below me, the ground fell away and down to a river.

远远地，在我的下方，地面（仿佛在随光线）向下延伸，（逐渐）退落，显露出谷底的河流。

A thin wisp of silver escaped his wand and hovered like mist before him.

他的魔杖冒出一缕银色的光线，像雾一样在他面前摇曳。

So, it's what happens when you have no light reflected back to the viewer.

所以，它就是一种没有光线从物体上反射回来的。

That helps to spread the light around.

这有助于光线的扩散。

Reading in dim light does harm to the eyes.

在昏暗的光线下看书对眼睛有害。

It must have been a trick of the light.

一定是光线的问题。

Vision depends on light entering the eye...a form of ocular intromission, if you will.

视觉依赖于进入眼睛的光线，如果你不介意这种说法的话，这是一种“眼睛插入”。

Currently, scientists treat the object with adhesive paper and light making a fingerprint visible.

目前，科学家们用胶粘纸和光线处理这些物品，使指纹清晰可见。

But that means that retinas in your eyes are not catching the light, either.

但这代表你的视网膜也无法捕捉到任何光线。

The walls were made of dark stone, dimly lit by torches.

四周的墙壁是用黑黑的石头砌成的，火把的光线昏暗阴森。

You know, film speed, the light, you know.

我们在一起探讨拍摄速度、光线这些东西。

Just finding soft light, just kind of gently fills the room.

只要一点柔和的光线，轻柔地充满整个房间。

You want the light to be right.

你想要合适的光线。

It's definitely blocking a lot of the rays.

它肯定会挡住很多光线。