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我试图在下拉菜单（英语，信息和手册）中插入3个列表，但它不工作。下拉菜单 - 不起作用
我在网上得到了这个非常酷和丰富多彩的菜单，并且我正在尝试添加更多列表。
任何人都可以看到我做错了什么吗？
/*===== header =====*/
header nav {
float:right;
}
header nav ul li {
float:left;
margin-left: -30px;
}
header nav ul li a {
font-size:22px;
color:#fff;
height:67px;
line-height:67px;
text-decoration:none;
width:101px;
text-align:center;
float:left;
background:#433b8f;
background-image: gradient(top, #383282, #484095); /* FF3.6 */
background-image: -moz-linear-gradient(top, #383282, #484095); /* FF3.6 */
background-image: -webkit-gradient(linear,left top,left bottom,color-stop(0, #383282),color-stop(1, #484095)); /* Saf4+, Chrome */
filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#383282', EndColorStr='#484095'); /* IE6,IE7 */
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorStr='#383282', EndColorStr='#484095')"; /* IE8 */
}
header nav ul li a.current, header nav ul li a:hover {
padding-bottom:5px;
}
header nav ul li:nth-of-type(2) a {
background:#0184cd;
background-image: -moz-linear-gradient(top, #017bc8, #018ed3); /* FF3.6 */
background-image: -webkit-gradient(linear,left top,left bottom,color-stop(0, #017bc8),color-stop(1, #018ed3)); /* Saf4+, Chrome */
filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#017bc8', EndColorStr='#018ed3'); /* IE6,IE7 */
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorStr='#017bc8', EndColorStr='#018ed3')"; /* IE8 */
}
header nav ul li:nth-of-type(3) a {
background:#7cbc19;
background-image: -moz-linear-gradient(top, #73b515, #86c31d); /* FF3.6 */
background-image: -webkit-gradient(linear,left top,left bottom,color-stop(0, #73b515),color-stop(1, #86c31d)); /* Saf4+, Chrome */
filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#73b515', EndColorStr='#86c31d'); /* IE6,IE7 */
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorStr='#73b515', EndColorStr='#86c31d')"; /* IE8 */
}
header nav ul li:nth-of-type(4) a {
background:#ffbc00;
background-image: -moz-linear-gradient(top, #ffb500, #ffc300); /* FF3.6 */
background-image: -webkit-gradient(linear,left top,left bottom,color-stop(0, #ffb500),color-stop(1, #ffc300)); /* Saf4+, Chrome */
filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#ffb500', EndColorStr='#ffc300'); /* IE6,IE7 */
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorStr='#ffb500', EndColorStr='#ffc300')"; /* IE8 */
}
header nav ul li:nth-of-type(5) a {
background:#f07502;
background-image: -moz-linear-gradient(top, #ee6c01, #f27f02); /* FF3.6 */
background-image: -webkit-gradient(linear,left top,left bottom,color-stop(0, #ee6c01),color-stop(1, #f27f02)); /* Saf4+, Chrome */
filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#ee6c01', EndColorStr='#f27f02'); /* IE6,IE7 */
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorStr='#ee6c01', EndColorStr='#f27f02')"; /* IE8 */
}
header nav ul li{position: relative;}
header nav li ul{position: absolute;display: none;}
header nav li:hover ul, header nav li ul li:hover ul, header nav li.over ul, header nav li ul li.over ul{display: block;}
header nav li ul li{width:100px; height:25px; line-height:20px;}
header nav li ul li:nth-of-type() a {
background:#7cbc19;
background-image: -moz-linear-gradient(top, #73b515, #86c31d); /* FF3.6 */
background-image: -webkit-gradient(linear,left top,left bottom,color-stop(0, #73b515),color-stop(1, #86c31d)); /* Saf4+, Chrome */
filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#73b515', EndColorStr='#86c31d'); /* IE6,IE7 */
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorStr='#73b515', EndColorStr='#86c31d')"; /* IE8 */
}<header>
<div class="container">
<h1><a href="index.html"><img src="images/inove.png"></a></h1>
<nav>
<ul>
<li><a href="index.html" class="current">Home</a></li>
<li><a href="about.html">Sobre</a></li>
<li><a href="privacy.html">Cursos</a>
<ul>
<li><a href="privacy.html">Inglês</a></li>
<li><a href="privacy.html">Informática</a></li>
<li><a href="privacy.html">Manutenção</a></li>
</ul>
</li>
<li><a href="gallery.html">Inscrições</a></li>
<li><a href="contacts.html">Contato</a></li>
</ul>
</nav>
</div>
</header>
感谢您的时间！但它仍然没有显示下拉菜单：/ –
在片段中，我看到“Inglês”，“Informática”和“Manutenção”鼠标悬停在“Cursos”上... –