.clearfix:after {
	display: block;
	content: '';
	height: 0;
	overflow: hidden;
	visibility: hidden;
	clear: both;
	*zoom:1;
}/*
.know_show_left {
	width: 70%;
	border: 1px solid #ddd;
	overflow: hidden;
}
.know_show_left dl {
	padding: 0 30px;
}
.know_show_left dd {
	margin: 0;
	padding: 10px 0;
	line-height: 21px;
	color: #333;
}
.know_show_left dd span span {
	color: #333;
}
.know_show_left dd i {
	font-style: normal;
	font-size: 16px;
	padding: 0px 5px;
}
.know_show_left dd a {
	padding: 0 5px
	font-size: 16px;
}
.know_show_right {
	float: right;
	width: 28%;
	height: 400px;
	border: 1px solid #ddd;
}*/