名词
中文翻译：预期寿命
同义词：
['average lifespan', 'median age at death', 'average lifespan at death']
例句：
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1. The study found that the life expectancy of people in this region is significantly higher than that of people in other regions.
研究发现，该地区居民的预期寿命显著高于其他地区。
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2. With improved healthcare, the life expectancy of people in this country has increased significantly.
随着医疗保健的改善，该国人民的预期寿命有了显著提高。
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3.Life expectancy is a key factor in determining how long people can expect to live.
预期寿命是决定人们可以预期活多久的关键因素。