光定，西夏神宗英文皇帝李遵顼的年号，历时十三年（公元1211—1223年）。
某些植物种类如果感觉到了太多光就不开花，而有些只有感觉到了一定程度的光才会开花。
Certain plant species won't flower if they sense too much light and some plants will only flower if they sense a specific amount of light.
您可以用环境光模拟前面的卧室场景，将所有对象都照亮到一定程度，从而提供了另外一个全向光源。
You could model the previous bed scene with an ambient light to lighten up all objects to some degree and create an additional omnidirectional light.
例如，古人观察到了水滴和某些雕琢过的宝石可以把光按照一定的方向折射出去。
For example, ancient people discovered that drops of water and certain gemstones distorted light in a predictable way.
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