最强的返回信号来自云层。
返回信号的强度提供了云和粒子的特征信息。
The strength of the returning signal provides information about the characteristics of the clouds or particles.
发射出信号并接受返回信号的天线是直接指向飞机的。
The aerial which sends out the signal and receives the reflected signal is pointed straight at the aircraft.
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