74 All About Light-Mid

All About Light Written by Brian Roberts

《关于光的一切》布莱恩·罗伯茨著

Have you ever turned off all the lights? Everything is dark. If you turn on the lights, now you can see.

你曾经关掉过所有的灯吗? 一切都是黑暗的。如果你把灯打开，现在你就能看见了。

You can't touch light. But you can see things when light shines on them. Your eyes see light. Then your brain tells you what you are seeing.

你碰不到光。但当光线照射到物体上时，你就能看到它们。 你的眼睛能看见光。然后你的大脑会告诉你你看到了什么。

We get a lot of light from the Sun. Many other things give us light, too. But most things do not make their own light. You only see them because light from somewhere shines on them.

我们从太阳那里得到很多光。 许多其他的东西也给我们光明。 但大多数事物并不是自己发光的。 你之所以能看到它们，是因为来自某个地方的光照射到了它们。

Light goes right through some things. Other things only let some light through. Many things let no light through at all. Almost all the light goes through. Some light goes through. No light goes through.

光可以直接穿过一些东西。 其他的东西只让一些光通过。 许多东西根本不让光通过。 几乎所有的光都穿过了。 一些光穿过。没有光通过。

When something blocks light, it soaks up some of the light. The rest bounces off. The light that bounces off lets you see the thing you are looking at. Do You Know? The Moon does not make light. Light from the Sun bounces off the Moon. That is why you can see the Moon.

当某物阻挡光线时，它会吸收一些光线。 剩下的部分会反弹。反射回来的光让你看到你正在看的东西。 你知道吗?月亮不发光。 来自太阳的光被月球反射。 这就是为什么你能看到月亮。