问题描述：
英语翻译
School life expectancy,approximation method.
The sum of the age-specific enrolment rates for the levels specified.To compensate for the lack of reliable data by age for tertiary education,the gross enrolment ratio for tertiary education is multiplied by and used as a proxy for the age-specific enrolment rates.At all other ISCED levels,enrolment that is not distributed by age is divided by the school-age population and multiplied by the duration of the given level before being added to the sum of the age-specific enrolment rates.
School life expectancy,approximation method.
The sum of the age-specific enrolment rates for the levels specified.To compensate for the lack of reliable data by age for tertiary education,the gross enrolment ratio for tertiary education is multiplied by and used as a proxy for the age-specific enrolment rates.At all other ISCED levels,enrolment that is not distributed by age is divided by the school-age population and multiplied by the duration of the given level before being added to the sum of the age-specific enrolment rates.
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