名词中文翻译
中文翻译：平均寿命
同义词：
['average lifespan', 'average age例句：1. The study found that the mean life-span of the species has increased by 5 years in the last decade.（研究发现，该物种的平均寿命在过去十年里增加了5年。）']
例句：
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1. The study found that the mean life-span of the species has increased by 5 years in the last decade.
研究发现，该物种的平均寿命在过去十年里增加了5年。
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2. The researcher calculated the mean life-span of the population based on their birth rates and death rates.
研究人员根据出生率和死亡率计算了该人群的平均寿命。
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3. The doctors estimated that the mean life-span of people over 65 would increase by another 10 years.
医生估计，65岁以上人群的平均寿命将再增加10年。