The great defense against the air menace is to attack the enemy's aircraft as near as possible to their point of departure.
对空中威胁的最大防御是攻击敌人的飞机，尽可能接近他们的出发点。
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Against
对空中威胁的最大防御是攻击敌人的飞机，尽可能接近他们的出发点。