no-fly zone
noun [ C ] uk/ˌnəʊˈflaɪ ˌzəʊn/ us/ˌnoʊˈflaɪ ˌzoʊn/
禁飞区
an area above a country that aircraft from other countries may not enter without risking attack
Aircraft will enforce the no-fly zone to protect UN forces on the ground. 为保护地面联合国部队的安全，将实施禁飞。