名词
中文翻译：扩散理论
同义词：
['diffusion equation', 'diffusion model', 'diffusion process']
例句：
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1. The diffusion theory explains how substances move from one place to another.
扩散理论解释了物质如何从一个地点移动到另一个地点。
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2. The diffusion theory is used to study the spread of diseases.
扩散理论被用来研究疾病的传播。
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3. The diffusion theory has been applied to many fields, including medicine and physics.
扩散理论已经被应用到许多领域，包括医学和物理学。