retention areas

基本解释

For example, the filter expression for selecting fixed storage areas with a retention period from 1 to 5 years, where the period is specified in minutes is
例如，选择保留期限为 1 至 5 年（期限以分钟为单位指定）的固定存储区域的筛选器表达式为
It supports designing medical curricula to improve graduate retention in rural areas, presumably only in regions with severe shortages in rural practitioners.
这项建议支持把医学课程设计得能够在农村地区更多地留住毕业生，据假设仅涉及农村行医人员严重短缺的地区。
On the basis of the actual population settlements, the paper points out the main problems of population settlements of flood retention areas in Huai River Basin of Anhui province.
论文在分析安徽省淮河行蓄洪区人口安置现状的基础上，指出人口安置存在的主要问题；

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As a result, school enrolment, retention and achievement rates are particularly low in rural areas and, more specifically, among indigenous people.
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