南极的

He let me in and went back to bed. They had a cot set up for me.

他让我进门后，就回到了床上。

Suppressing airdefense operation has become a main type of air attack in order to decrease danger and man damage, pilotless aircraft is just suitable to this requirement.

压制防空作战已成为近期局部战争的一个主要空中攻击作战模式，降低风险、减少人员伤亡是这种战法的初衷，无人机正适应这种需求。