县级单位对监测资料的利用能力较差；
The capacity of HIV/STD surveillance is worse at county level.
通过除去移民因素，合并人口较少的县，他们把美国的3141个县分为了2068个“县级单位”；再调查每个县的死亡率。
They looked at death rates by county, having corrected for migration and merged sparsely populated ones so that America's 3, 141 counties became 2, 068 “county units”.
上海市是一个省级单位，有19个县级行政区域。包括18个区和1个县。
Shanghai is administratively equal to a province and is divided into 19 county-level divisions: 18 districts and 1 county.
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