本文作者： 21ST

VIP教师会员和本期电子版订户登录后下载

IN the last few years our communications network (网络) has been growing at a very fast pace. The old fixed-line telephone has been replaced by mobile phones, Short Message Service (SMS), e-mail and instant messaging (IM, 即时消息). And there are other new ways of communicating related to the Internet, such as blogs (博客)...