Demand for elderly care has increased by 9% over the past four years, and it is set to rise further as life expectancy climbs (while the proportion of the population of working age shrinks).
在过去的4年中，老年人护理的需求增长了9%。随着对生命期望的攀升，需求还将增长更多(而工作的人口比例在缩水)。
In this paper, we start at the demand prediction of spare parts, use statistical analysis to study the distribution of spare parts' life in equipments, and get the distribution of the demand further.
本文从备件的需求预测入手，对备件在设备中的寿命分布进行统计分析，进而得到该型号备件在设备中的需求分布类型。
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