先看图：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head><title></title>
<style type="text/css">
dl {
float:left;
margin:0 1px 0 0;
padding:0px;
width:150px;
background:#dff;
}
dl dt{
text-align:left;
background:#ddf;
}
dl dd{
text-align:left;
background:#daf;
display:none;
}
dl:hover dd{
display:block;
}
</style>
</head>
<body>
<ul>
<dl>
<dt><a href="#">beijing1</a></dt>
<dd><a href="#">chaoyang1</a></dd>
<dd><a href="#">fengtai1</a></dd>
<dd><a href="#">mentougou1</a></dd>
</dl>
<dl>
<dt><a href="#">beijing2</a></dt>
<dd><a href="#">qinghua</a></dd>
<dd><a href="#">beida</a></dd>
<dd><a href="#">beiyou</a></dd>
</dl>
<dl>
<dt><a href="#">beijing3</a></dt>
</dl>
<dl>
<dt><a href="#">beijing4</a></dt>
</dl>
</ul>
</body>
</html>
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