diffusionn.
英 dɪ'fjuːʒ(ə)n | 美 dɪ'fjʊʒən
中文n. 扩散，传播；[光] 漫射
词根词源
diffusion (n.)late 14c., from Latin diffusionem (nominative diffusio) "a pouring forth," noun of action from past participle stem of diffundere "scatter, pour out," from dis- "apart, in every direction" (see dis-) + fundere "pour" (see found (v.2)).
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