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>