汉语翻译

n. 散播, 传播, 蔓延
【医】 扩散, 弥散, 漫射(光)

词型变化：

形容词:diffusional 

英语解释：

名词 diffusion:

1. (physics) the process of diffusing; the intermingling of molecules in gases and liquids as a result of random thermal agitation
2. the spread of social institutions (and myths and skills) from one society to another
3. the property of being diffused or dispersed
   同义词：dissemination
4. the act of dispersing or diffusing something
   同义词：dispersion, dispersal, dissemination

例句：

1. Insulation used to prevent heat diffusion, as from a steam pipe.
   绝热材料用来防止热量散失的绝热材料，如从蒸汽输送管上

详细解释：

dif.fu.sion

n.（名词）
The process of diffusing or the condition of being diffused.
扩散：扩散的过程或扩散的条件
Needless profusion of words; prolixity.
冗长：没完没了有好多话；冗长而罗嗦
Physics
【物理学】
The scattering of incident light by reflection from a rough surface.
漫射：入射光线在粗糙表面的反射下分散
The transmission of light through a translucent material.
透射：光在半透明材料中透射
The spontaneous intermingling of the particles of two or more substances as a result of random thermal motion.
分子扩散运动：两种或更多种物质的分子由于随机的热运动自发混合在一起

【引伸】
diffu.sional
adj.（形容词）