这个bug很常见，首先看示例代码：
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>000</title>
<style type="text/css">
*{margin:0; padding:0;}
body{font-size:12px; color:#333;}
#list{font-family:Arial; list-style:none;}
#list li{float:left;margin-right:10px;}
</style>
</head>
<body>
<ul id="list"><li>12条留言</li><li>回复</li></ul>
</body>
</html>
IE下中英文混排bug