1. (枪的)扳机
    The trigger of a gun is a small lever which you pull to fire it.

trigger

    e.g. A man pointed a gun at them and pulled the trigger.
           一名男子拿枪指着他们，接着扣动了扳机。

2. (炸弹的)引爆器
    The trigger of a bomb is the device which causes it to explode.

trigger的翻译

    e.g. ...trigger devices for nuclear weapons.
           核武器的引爆器

3. 引爆;启动;触发
    To trigger a bomb or system means to cause it to work.

trigger

    e.g. The thieves must have deliberately triggered the alarm and hidden inside the house...
           盗贼肯定是故意触发了报警器，然后躲在房子里。
    e.g. The one thousand pound bomb was triggered by a wire.
           那颗重达 1,000 磅的炸弹是由一根导线引爆的。

4. 引起;发动;促使
    If something triggers an event or situation, it causes it to begin to happen or exist.

    e.g. ...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
    e.g. The current recession was triggered by a slump in consumer spending…
           目前的经济衰退是由消费支出骤跌引起的。

5. 诱因;起因;引发…的原因
    If something acts as a trigger for another thing such as an illness, event, or situation, the first thing causes the second thing to begin to happen or exist.

trigger是什么意思

    e.g. Stress may act as a trigger for these illnesses.
           压力可能会成为引发这些疾病的原因。