研究了地面目标的可见光特征。
In this paper, the visible light characteristic of ground target was studied.
攻击机在对地面目标进行攻击前必须首先发现目标。
The attackers must discover the targets on the ground first before attacking them.
攻击机在对地面目标进行攻击前必须首先发现目标。
The attackers must discover the targets on the ground first before attacking them.
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