名词
中文翻译：平均寿命期
同义词：
['average duration of life', 'average life span']
例句：
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1. The averagelife period of this species is 20 years.
这种物种的平均寿命期为20年。
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2. The average life period for a newborn baby is around six months.
新生儿的平均寿命期大约是六个月。
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3. With proper nutrition and exercise, the average life period can be extended.
通过适当的营养和运动，平均寿命期可以延长。