修改div下第二个dt下的dl的高 (一个挺难又简单 的小jquery)

<div class="city_main">
<p class="cate_title">所有城市</p>
<div class="hd_provincelist">
<div class="hd_province_detail clearfix" id="province_detail_uid">
<foreach name="areas.area" item="are">
<dl class="clearfix">
<dt>{$are}：</dt>
<foreach name="areas.site" item="ar">
<if condition="$ar['area'] eq $are">
<dd class="dd_detail"><a href="//{$ar['second_url']}.{$server_name}?mark=1">{$ar['city']}</a></dd>
</if>
</foreach>
</dl>
</foreach>
</div>
</div>
</div>
<script>
$("#province_detail_uid dl:nth-child(2) dt").css("height","45px");
</script>