常見(jiàn)例句用作名詞 (n.)Mayday!Mayday!require air support immediately!呼叫空中支援，呼叫空中掩護(hù)。For this operation we need plenty of air cover,ie protection by military aircraft.爲(wèi)進(jìn)行這次軍事行動(dòng)，我們需要充足的空中掩護(hù)。 返回 air cover