all-clear

n the all-clear (usu sing 通常作单数) signal that danger is over 解除警报的信号; 解除危险的信号.

all but, All Fools' Day, all in all, all of a sudden, all one's life, all out, all over, all over again, all right, all risks, all round, All Souls' Day, all the more, all the same, all the time, all the way, all the years round, all through the night, all too, all-, all-in, all-night, all-round, all-star, all-time, all-urpose, Allah, allay, allegation, allege, alleged, allegedly, allegiance, allegorical, allegorically, allegory, allegretto, allegro, alleluia, allergic,