名词
中文翻译：平均寿命
同义词：
['average lifespan', 'average age', 'average span of life']
例句：
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1. The meanlifetime of a species is the time it takes for that species to reach its maximum population size.
一个物种的平均寿命是它达到最大种群数量所需的时间。
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2.The researcher found that the mean lifetime of the disease had increased by 5% in the last decade.
研究人员发现，该疾病的平均寿命在过去十年里增加了5%。
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3.The mean lifetime of the company's products has been increasing steadily over the past five years.
该公司产品的平均使用寿命在过去五年里稳步增长。