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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, ...

The Amazing Race Season 38 finale aired on Wednesday, December 10. The three final teams raced from France to New York. The team who crossed the finish line first won $1,000,000. It all comes down to ...

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。

1989年6月6日，抗议被镇压后，北京街头的居民和士兵。 LIU Heung Shing/Associated Press 北京——1989年春，学生对天安门广场的占领进入了第二个月，中国领导层紧张不安、意见相左。一天傍晚，军方高级将领被召集到军区总部，表态支持动用武力镇压抗议者。 1989年5 ...

Share your traditions, weigh in on a seasonal debate, write a story, reflect on the year behind you, or prepare for the one ahead. By Natalie Proulx and Katherine Schulten The Times Upshot reporter ...

Vikki Velasquez is a researcher and writer who has managed, coordinated, and directed various community and nonprofit organizations. She has conducted in-depth research on social and economic issues ...