n.扩散；散布；传播；漫散
The diffusion process seems to be accelerating. 传播过程看来正在加速。
This diffusion of knowledge accelerated dramatically in recent decades. 近几十年来，知识的传播速度大大加快。
Clouds cause the diffusion of light from the sun. 云使阳光漫射。
弥漫说
