求翻译：6.物业的网上销售及中介代理，网上房屋租赁与交换。该类网站是目前房地产商和互联网业都关注的焦点，已经开始B TO C电子商务，目前主题有的已经很鲜明，而且二手房成交量、在线定房量在逐步放大。随着国内住房二级市场的开放，房地产交易就会提供和需要大量的信息交易，建立网上房地产信息超级市场具有良好的前景。是什么意思？

6. the property of online sales and brokerage, lease and Exchange on the Internet. Such sites are real estate industry and the Internet are now the focus of attention, have begun to b TO c, e-commerce, current topics and some have been very clear, but second-hand trading volume, gradually enlarge the room online. With the opening of domestic secondary housing market, real estate transactions will be provided and requires a lot of information transactions, online real estate information supermarket has good prospects.