USMC VH-60 Blackhawk flies through Toronto's financial district, hovering over Union Station at a verylowaltitude, between the skyscrapers at 1pm on June 23rd, 2010.
Due to the existence of radar blind spot, the invasive goals flying at lowaltitude and verylowaltitude will bring problems and threats to the defense radar system.
由于雷达探测存在盲区,低空与超低空飞行的入侵目标给雷达防御系统带来困难与威胁。
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At that lowaltitude, this orbit will not last very long, and the satellite will reenter into the Earth's atmosphere.