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TOEFL BNC: 12694 COCA: 11051

diffusion

noun
/dɪˈfjuːʒn/
/dɪˈfjuːʒn/
[uncountable]
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  1. (formal) the act of spreading something widely in all directions; the fact of being spread in all directions扩散:向各个方向广泛传播某物的行为;四面八方传播
    • the diffusion of Marxist ideas马克思主义思想的传播。
  2. (specialist) the act of slowly mixing a gas or liquid in a substance; the process in which this happens 扩散:将气体或液体缓慢混合在物质中的行为;发生这种情况的过程
    • the rate of diffusion of a gas气体扩散的速度。
  3. (formal) the act of making a light shine less brightly by spreading it in many directions(使光)模糊,漫射,漫散
    • the diffusion of light by a convex surface光通过凸面的扩散

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