你能把这灌木丛剪短些吗？它开始遮住房子的部分光线了。
Will you prune this bush down? It's beginning to shut out some light from the house.
在括号中的那部分光线计算，是计算所有照射到物体上的光线。
The light parts of the equation (within parenthesis) is repeated for all lights that hit the object.
中午阳光明媚，瞳孔缩小成一条线，使大部分光线不能进入眼睛。
In bright noon sunlight, the pupil shrinks to a narrow slit that keeps most of the light out of the eye (2).
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