You must be ready to leave at a moment's notice.

你必须随时准备出发。

《牛津词典》

There is a tendency to shut museums or shops at a moment's notice.

有一接到通知就关闭博物馆或商店的趋势。

《柯林斯英汉双解大词典》

Or is does it just have the capability to scale at a moment's notice?

或者它只是具有能够在瞬间完成扩展的能力？

youdao

"That was reassuring, but it also meant that if you were unidentified you had potential friendly fire not too far away at a moment's notice."

VOA: standard.2010.04.06

Secretary Clinton said Wednesday that Bosworth had been prepared to travel to North Korea "at a moment's notice" during his first mission to the region last week, but said he regrettably did not get an invitation to do so.

VOA: standard.2009.03.12

But the boat's not forgotten--it's docked right out back--so he can still take trips at a moment's notice.

FORBES: Home Fleet Home

They had my Gram (and all residents) packed up and ready to be moved at a moment's notice.

CNN: Your stories of heroism amid flames

Once you open your doors, get ready for your staff to walk out through them at a moment's notice.

FORBES: Magazine Article