There were 15 minutes between the first air raid alert and the sounding of the all-clear signal.

从第一个空袭警报到警报解除号音其间有15分钟。

《柯林斯英汉双解大词典》

Steinbruck told the Bild am Sonntag newspaper: "Any all-clear signal would be false."

施泰因布吕克告诉德国图片报：“任何解除警报的信号都是假的。”

youdao

However, tracking data showed the debris would not come close enough to warrant an evacuation of the station, NASA said in a statement issued after the crew was given the all-clear signal.

然而，在空间站人员收到警报解除的信号之后，NASA发布了一份声明，称跟踪数据表明卫星碎片的距离不会接近到需要确保能进行空间站撤离的地步。

youdao

Earlier in the day, the Fed got what amounts to an all-clear signal to lower rates without having to worry about near-term inflationary consequences.

FORBES: Magazine Article

Recently, inaction by the California Franchise Tax Board (FTB) gave all Silicon Valley entrepreneurs a clear signal: make your residence in California a temporary or transitory one.

FORBES: For Entrepreneurs, California's Tax Code Becomes The Roach Motel

This is a clear signal that businesses are reluctant to hire in large enough numbers to bring down this all-important number.

FORBES: The Stock Market And Recessions