A man pointed a gun at them and pulled the trigger.

一名男子拿枪对着他们并扣动了扳机。

trigger devices for nuclear weapons.

核武器的引爆装置。

Stress may act as a trigger for these illnesses.

压力也许是引发这些疾病的一个原因。

It is still not clear what events triggered off the demonstrations.

还不清楚是什么事件引发了示威活动。

The thieves must have deliberately triggered the alarm and hidden inside the house.

那些小偷一定是故意触发了报警器，然后藏在屋子里。

the incident which triggered the outbreak of the First World War.

导致第一次世界大战爆发的事件。

The current recession was triggered by a slump in consumer spending.

当前的经济衰退是由消费支出大幅下降引起的。