a formation of military planes maintained over ground operations or targets; "an air umbrella over England"
地上作戦や目標に対して続行される軍用機のフォーメーション
umbrella
having the function of uniting a group of similar things; "the Democratic Party is an umbrella for many liberal groups"; "under the umbrella of capitalism"
類似の物のグループを作る機能を持っていること
umbrella
covering or applying simultaneously to a number of similar items or elements or groups; "an umbrella organization"; "umbrella insurance coverage"