单词	air alert
释义	air alert noun 1 : the period during which military and civilian agencies are required to be in readiness for an enemy air attack also : the warning signal that begins such a period 2 : combat or standby status of the aircraft, aircrew, and ground communications system that may have to repel the enemy air attack Word History First Known Use 1927, in the meaning defined at sense 1
随便看	mezzo mezzo forte mezzo legato mezzo piano mezzo-relievo mezzo-relievos mezzo-rilievo mezzo-soprano mezzo-soprano clef mezzoer mezzoest Mezzogiorno mezzograph mezzos mezzotint mezzotinted mezzotinter mezzotinting mezzotintos mezzotints Meštrović mf MFA mfas MFBM

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