名词
中文翻译：平均寿命
同义词：
['average lifespan', 'average age']
例句：
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1.The study found that the mean life time of the disease is increasing.
研究发现，该病的平均寿命正在增加。
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2. The company's mean life time for its products is 5 years.
该公司产品的平均使用寿命为5年。
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3. The researcher calculated the mean life time of the materials based on their chemical properties.
研究人员根据材料的化学性质计算了这些材料的平均使用寿命。