上面的雷达影像在两天前，由位于美国加利福尼亚金石的深空网络雷达望远镜拍摄的。
The above radar image was taken two days ago by the Deep Space Network radio telescope in Goldstone, California, USA.
宇宙飞船的位置可以根据追踪它的无线电信号来确定，也可以用望远镜和雷达来确定。
A spaceship's position can be located by following its radio signal, or by using telescopes and radar.
雷达扫描到了它（上图就是一幅雷达扫描结果），望远镜追踪了它的轨迹。
Radars scanned it (the image right is one result) and telescopes tracked its path.
美国一直都拥有全球最发达的由雷达和望远镜网络组成的太空监测系统，但其侦察零散不全。
America already has the world's most developed space monitoring system with a network of radars and telescopes. But its surveillance is patchy.
金属波导用在微波炉、雷达系统、无线电望远镜等技术。
Metal waveguides are used in such technologies as microwave ovens, radar systems, radio relay systems, and radio telescopes.
金属波导用在微波炉、雷达系统、无线电望远镜等技术。
Metal waveguides are used in such technologies as microwave ovens, radar systems, radio relay systems, and radio telescopes.
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