To fire the gun, pull the trigger.

要开枪就须扣动板机。

youdao

If you move one step further, I shall fire the gun.

如查你再向前迈一步，我就开枪了。

youdao

They raked the streets with machine-gun fire.

他们用机枪在街上扫射。

《牛津词典》

Before marching away, the soldiers set fire to the gun factory and arsenal.

VOA: special.2009.08.20

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 fire did not destroy all the equipment at the gun factory.

VOA: special.2009.08.20

At the end of the day I can supply the bullets but I don't fire the gun.

BBC: Gray under orders to go back up

At the inquest, the firearms expert who had examined the twelve-gauge Mossberg testified that it normally takes five pounds of pressure on the trigger in order to fire the gun.

NEWYORKER: A Loaded Gun

But the gun lobby gets its fire power from the gun manufacturers.

FORBES: Connect