名词
中文翻译：传播因子
同义词：
['propagation factor', 'diffusion factor']
例句：
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1.The spread of the virus is a major concern for public health officials.
病毒的传播是公共卫生官员们的主要关切。
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2. The researcher found that the spreading factor was related to the type of soil.
研究者发现，传播因子与土壤类型有关。
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3. The new drug has a low spreading factor, which means it is less likely to cause side effects.
这种新药的扩散系数低，意味着它不太可能引起副作用。