Doppler modulated echoinformation of helicopter rotors has a better stability of the aircraft's attitude, which is the main information source of radar identifying helicopters.
旋转部件的多普勒调制信息具有良好的姿态角稳定性，是雷达识别直升机的主要信息来源。
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When the echo returns to the hunting bat, the predator can glean information about the size, location and more of prey.
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