求翻译：我市适龄健康人群的麻疹、脊灰抗体阳性率维持在较高水平，但乙肝表面抗体水平较低。随着年龄的增长，对一些疫苗加强接种也是很有必要的。是什么意思？

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I city crowd of age-appropriate health measles, polio antibody-positive rate at a relatively high level, but hepatitis B surface antibody levels are relatively low. As he grew older, for some vaccines strengthen vaccination is also a necessity.

My city healthy crowd's measles, polio immune body masculine gender rate maintenance of age in high level, but the hepatitis B surface immune body level is low.Along with the age growth, also has the necessity very much to some vaccine enhancement vaccination.

-Age of measles among healthy population in our city, polio antibody positive rate remains at a relatively high level, but hepatitis b surface antibody levels are low. As he grew older, some vaccine booster shot is necessary.