名词
中文翻译：平均寿命
同义词：
['average lifespan', 'average duration', 'median lifespan']
例句：
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1. The average life time for this species is about 20 years.
这种物种的平均寿命约为20年。
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2.The average life time of a human being is around 75 years.
人类的平均寿命大约是75年。
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3.The average life time of the planet Earth is estimated to be around 4.5 billion years.
地球的平均寿命估计为45亿年。