We don't think about that as often as we think about light pollution.
我们不像思考光污染那样经常思考这个问题。
光是怎样的？
A good way to think about light is to pretend that it's water.
一个很好的方法是把光想成水。
Einstein's new theory on optics changed classical scientific ideas about light.
爱因斯坦新的光学理论改变了人们对光的传统科学概念。
Make sure to incorporate everything that you've learned about light, detail, and photographic technique, to make sure that nothing technical interrupts the power of the image.
要确切地融会贯通你曾学过的光线、细部及影像处理技法，并留意不要让技术问题阻隔了影像的力量。
Talking about light, light is essential.
光，是非常必要的。
Classic scientific ideas about light were changed by Einstein.
爱因斯坦改变了对于光的古典科学观念。
Classical scientific ideas about light were changed by Einstein.
爱因斯坦改变了科学上关于光的传统观念。
Today, I'm going to talk about light, and in particular about laser beams.
今天，我要谈一谈光，特别是镭射光。
This paper puts forward a new method about light-guiding fiber diameter-measuring system.
文中提出光导纤维直径测量系统的新方法。
The quality of projection continues to improve. It's usually about light levels more than anything.
放映的质量在不断改善，通常亮度水平比什么都重要。
Meanwhile, the capacity of accommodation about light and water circumstances of seedlings was higher than that of the cutting stocks.
同时，实生苗对光环境和水分环境的适应能力优于扦插苗。
Meanwhile, the capacity of accommodation about light and water circumstances of seedlings was higher than that of the cutting stocks.
同时，实生苗对光环境和水分环境的适应能力优于扦插苗。
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