名词
中文翻译：水活性
同义词：
['water activity coefficient', 'water activity ratio', 'water activity index']
例句：
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1. The water activity of this soil is very low, indicating that it has a high ability to retain moisture.
这种土壤的水活性很低，表明它具有很强的保水能力。
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2. The water activity of the food can affect its shelf life and quality.
食品的水活性会影响其保质期和质量。
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3.The water activity of the soil can be affected by various factors, such as temperature and humidity.
土壤的水活性会受到温度和湿度等多种因素的影响。