A hair-trigger situation has been created which could lead to an outbreak of war at any time.

局势风云突变，战争一触即发。

《柯林斯英汉双解大词典》

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Chemical sprays like air fresheners,hair spray, household cleaning products and even strong perfumes can also trigger an asthma attack.

VOA: special.2009.07.28

Chemical sprays like air fresheners, hair spray,cleaning products and even strong beauty aids can trigger an asthma attack.

VOA: special.2010.09.07

In a crisis, the temptation would always be to hold these missiles on a hair trigger, to be launched on warning of an incoming attack rather than lost to an enemy strike.

ECONOMIST: It's worse than you thought

What is more, it is a hair trigger.

ECONOMIST: America and Iraq

The same Capsugel deal today, Kravis said, would have a cost of capital near 9%, a reflection of the late-summer weakness in equity markets and window closing in the high-yield market, which moves on a hair trigger in turbulent times.

FORBES: KKR's Henry Kravis: 'Any Fool Can Buy A Company'