帮忙解释一段代码
<%if   session( "purview ")> =3   and   session( "purview ") <=4   and   PurviewChecked=False   then   response.write   "disabled "%>

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详细解释：当字段 purview的值在3到4间，并且PurviewChecked为假（false）时，条件成立时，执行response.write "disabled " 语句，结果显示：disabled