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The Marines fired back with a grenade launcher.

海军陆战队用手榴弹发射器反击。

《柯林斯英汉双解大词典》

The antitank SPG-9 "Kopyo" (" Spear ") grenade machine is not an automatic but recoilless gun. It consists of a trunk with a lock, a tripod stand and an electric mechanism which serves for firing.

这种反坦克spg - 0“Kopyo ”飞弹机是非自动无后座力炮，包含一个带锁箱，一个三脚架和一个开火用的电气机械装置。

youdao

A passenger in a car threw a grenade that exploded as a crowd demonstrated against the Yemeni government.

VOA: special.2011.02.19

Saturday night in Acapulco was livelier than usual, with gun shots and grenade blasts echoing through the streets near beachside hotels.

VOA: standard.2009.06.09

Hours later in Peshawar, officials say an attacker in a parked car threw a grenade at a crowd of people outside the Askari Bank before exploding in the car.

VOA: standard.2009.09.26

As you can tell, Corporeal Dunham died from the wounds he suffered when the grenade exploded.

NPR: Marine Receives Posthumous Medal of Honor

He was preparing to throw the grenade when he was tragically hit by enemy fire.

BBC: VC hero L/Cpl James Ashworth 'supremely courageous'

He was wounded by the grenade and died of his wounds despite receiving medical treatment.

BBC: Body of Royal Marine James Wright repatriated