求翻译：为了解潜江市适龄人群中麻疹、脊髓灰质炎和乙肝的免疫状况，抽样评价免疫预防接种服务质量和水平，为实施有效的预防措施和控制策略提供科学依据。是什么意思？

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To learn more about their potential in Jiujiang city school-age crowd measles, polio and hepatitis B, and sample the immune status immunization vaccination quality evaluation, and level for the implementation of effective preventive measures and control strategies provide a scientific basis.

In order to understand in the Qianjiang crowd of age measles, polio and the hepatitis B immunity condition, the sampling appraisal immunization vaccination grade of service and the level, are the implementation effective preventive measure and the control strategy provide the scientific basis.

To understand the qianjiang city in a school-age population of measles, polio and hepatitis b immune status, sampling quality evaluation of immune vaccination services and standards for implementing effective preventive measures and control strategy to provide the scientific basis.