Light and Colors.
光和颜色。
Light is energy.
光就是能量。
It travels in a straight line.
它沿直线运动。
Sunlight comes from the sun.
阳光来自太阳。
Sunlight looks white, but it really has many colors.
阳光看起来很白，但它真的有很多颜色。
When sunlight passes through a prism, you can see that it really has many colors.
当阳光透过棱镜时，你可以看到它真的有许多颜色。
The prism splits white light into colors.
棱镜将白光分成颜色。
Sometimes we can see this happen in the sky on special days.
有时我们可以在特殊的日子里看到天空中发生这种情况。
Sunlight passes through drops of water in the sky.
阳光穿过天空中的水滴。
The drops act like a prism and a rainbow is created.
水滴就像棱镜一样，彩虹就形成了。
Light passes through air easily.
光很容易通过空气。
We cannot see air.
我们看不到空气。
We can only see objects that light has reflected off.
我们只能看到被光反射的物体。
Light reflects off an object and enters our eyes.
光从物体反射进入我们的眼睛。
That is how we see.
这就是我们的看法。
A mirror reflects light very well.
镜子反光很好。
Some objects can filter light.
有些物体可以过滤光线。
Only one or some of the colors of light can pass through the object.
只有一种或几种颜色的光可以穿过物体。
The other colors are blocked.
其他颜色被挡住了。