... 备用设备 stand-by facility 备用图 supplement map 备用原图 safety copy ...
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Map supplement 补图
·2,447,543篇论文数据，部分数据来源于NoteExpress
Alaska, admitted to the Union in January 1959, is profiled in several articles, and a map of the newest state is included as a supplement with the issue.
该期多篇文章介绍了1959年1月加入联邦的阿拉斯加州，一张最新美国地图也随刊发行。
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