名词
中文翻译：年度和数位之和法
同义词：
['sum of the digits', 'sum of the years digits例句：1. The annual and number-of-digits method is a common way to calculate the average life expectancy in a population.（年度和数位之和法是计算人口平均预期寿命的常见方法。）']
例句：
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1. The annual and number-of-digits method is a common way to calculate the average life expectancy in a population.
年度和数位之和法是计算人口平均预期寿命的常见方法。
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2. In this method, each year's data is added together to find the total sum of the digits.
在这一方法中，每年的数据显示相加以找到总和数位。
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3. The sum-of-the-years-digits method has been used to estimate the population growth rate for many countries over the past decade.
过去十年里，这种方法被用于估计许多国家的人口增长率。