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Abstract: I welcome you to the fourth issue of the IEEE Communications Surveys and Tutorials in 2021. This issue includes 23 papers covering different aspects of communication networks. In particular, ...

See what you remember about this extraordinary year by taking our special 2025 news quiz. Compiled by Jeremy Engle The Times Upshot reporter Claire Cain Miller joins us in January to chat with ...

所有电子书均来自国际互联网，这次数据库里只收录了其中一部分目录名称，其余部分将持续更新。 服务器每天只运行12个小时(10:00 ~ 22:00)（北京时间） , 其他时间可能无法连接。