谈论科技对通讯的影响 — 英语词汇题
题目
根据句意及首字母提示补全单词，并写出其中文意思，完成关于通讯科技变化的句子。1. In the past, people wrote l______ (信) to keep in touch with friends far away. 2. Now most people use s______ (智能手机) to chat online at any time. 3. We can send v______ (视频) calls, so we can see each other while talking.