供应开始减少，本周早些时候，五个人徒步穿越雪地；周五，经过四天的跋涉，他们到达了一个正在工作的军事无线电中心。

Supplies began running low and early this week, five set off on foot across snow fields; on Friday, after four days of trudging, they reached a working military radio center.

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在20世纪40年代，空中交通管制中心能够而且确实利用了第二次世界大战中新研制的雷达和改进的无线电通讯，但是这个系统还处于初级阶段。

In the 1940s, ATC centres could and did take advantage of the newly developed radar and improved radio communication brought about by the Second World War, but the system remained rudimentary.

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绿色部分则是来自于哈勃太空望远镜的光学数据；位于墨西哥的甚大阵射电望远镜接受的无线电数据则贡献了星系中心的蓝色部分。

Green shows optical data from the Hubble Space Telescope, and blue at the galaxy's core represents radio data from the Very Large Array in New Mexico.

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