zhǎng wò / zhì kōng quán / hòu / bù duì / cái néng / gèng / ān quán de / zhǎn kāi / dì miàn / xíng dòng

掌握制空权后，部队才能更安全地展开地面行动。

Only after gaining air supremacy can the troops carry out ground operations more safely.