air cover造句

1、They could not provide adequate air cover for ground operations.
他们无法为地面作战行动提供足够的空中掩护。

2、The reasonable parameters of the convolute air cover and axial speed attenuation rule were found.
获得了影响回旋气幕形成各主要因素的合理参数以及轴向速度衰减规律。

3、The ships needed air cover once they reached enemy waters.
已到达敌方的水域，船只就需要空中掩护。