diffusion

definition: 
The action of spreading the light from a light source evenly to reduce glare and harsh shadows;The dissemination of elements of culture to another region or people;The dissemination of elements of culture to another region or people:
sentence: 
Some parts are painted white to assist with light diffusion, but the essential texture and character of the material is still legible.
According to world culture theorists, the diffusion took place in three phases.
difficulty: 
easy
toefl frequency: 
2
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