参考词典中life expectancy的常规释义：
基本释义
- n.平均寿命(=expectation of life)
参考例句
- Women have a higher life expectancy than men.
女人比男人的预期寿命长 - A life expectancy of70years.
预计70岁的寿命 - Life expectancy is now75.5years.
现在的平均寿命已达到75。5岁。
英英解释
- an expected time to live as calculated on the basis of statistical probabilities
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