环境反射：由环境光源反射的光线。
Ambient reflection: The light that is reflected by an ambient light source.
由强方向性光源和较弱的环境光源组合在一起可以为你的场景提供一种自然的感观。
A combination of a strong directional light and a weaker ambient light gives a natural-looking appearance to your scene.
你还可以创建一个环境光源以产生无方向性的光，或者点光源，如果你想对你场景中的特定区域聚焦。
You can also create an AmbientLight which will produce a directionless light, or a SpotLight if you want to focus on a particular part of your scene.
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