The duration of marriage is related most obviously to the expectation of life.
很明显，婚姻生活的持续时间与人的预期寿命有关。
Free life has been the expectation of the people for thousands of years.
风流倜傥、潇洒自在，千百年美满生活的期待。
Therefore, it is necessary to offer the formula for the calculation of expectation-of-life.
所以给出平均余寿的计算式非常必要。
Therefore, it is necessary to offer the formula for the calculation of expectation-of-life.
所以给出平均余寿的计算式非常必要。
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