(~s)
A ~ is an area of sky where military and other aircraft are not allowed to fly, especially because of a war.
N-COUNT
(~s)
A ~ is an area of sky where military and other aircraft are not allowed to fly, especially because of a war.
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012