Low altitude target detection and tracking is one of the four difficult problems for radar.
低空目标的探测与跟踪是雷达所面临的四大难题之一。
Radar has already became one of the most important equipments for deep-space detection.
雷达已成为深空探测的重要设备。
Radar has already became one of the most important equipments for deep-space detection.
雷达已成为深空探测的重要设备。
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