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

If you squeeze the trigger of a gun really hard and really fast, it doesn't fire any faster or harder than if you just squeezed it gently.

快速有力地扣动扳机,并不比你轻扣扳机,射出的更加快速或更加有力

耶鲁公开课 - 心理学导论课程节选

The photograph is able to do that, is able to trigger these thoughts.

照片可以达到这个效果,可以引起这些回忆

耶鲁公开课 - 死亡课程节选

In terms of the trigger, the provisions called for by the trigger are onerous.

WHITEHOUSE: Press Briefing

This suggests that the same signals that trigger the fat expansion will also trigger hair regrowth.

FORBES: Scientists Discover a Possible Key to Reversing Baldness

Any breaks of key support and resistance could trigger further moves, particularly if the market were to trigger sell or buy stops.

FORBES: Gold Traders Eye U.S. Dollar, Technicals As Consolidation Continues