Light .
光。
Light is a kind of energy.
光是一种能量。
Light comes from the sun.
光来自太阳。
Light also comes from flashlights, candles, and streetlights.
光也来自手电筒、蜡烛和路灯。
Light is important because it lets us see things.
光很重要，因为它让我们看到东西。
Light can pass through clear objects.
光可以穿过清晰的物体。
Light passes through clear glass or clear plastic.
光线穿过透明玻璃或透明塑料。
But light cannot pass through objects, which are not clear.
但是光不能穿过物体，物体不清晰。
Sunglasses will block some light and protect your eyes.
太阳镜会阻挡一些光线，保护你的眼睛。
When you shine a flashlight on a toy, a dark shape of the toy will be formed.
当你用手电筒照射玩具时，玩具会形成一个深色的形状。
It is called a shadow.
它被称为阴影。
A shadow is made when an object blocks light.
当物体挡住光线时，就会产生阴影。
You can see many shadows on a sunny day.
在晴天你可以看到许多阴影。