rocket-propelled grenade       
noun [ C ] uk/ˌrɒk.ɪt.prə.peld ɡrəˈneɪd/ us/ˌrɑː.kɪt.prə.peld ɡrəˈneɪd/ (abbreviation RPG)
 火箭筒;火箭推进榴弹
a weapon that fires an exploding rocket (= an object that flies very fast through the air) towards a target, usually a tank (= a military vehicle with wheels that turn inside moving belts)
  The fighters fired a barrage of rocket-propelled grenades at the advancing American forces. 武装人员向前进中的美军发射了一连串的火箭弹。 
 Within a minute, rocket-propelled grenades burst around them. 不到一分钟,火箭弹就在他们周围爆开。 
 - More examples
 - The support truck needed help after it was struck by a rocket-propelled grenade.
 - As they began treating him, a rocket-propelled grenade blew up a car nearby.
 - There were 28 separate hostile incidents including five rocket-propelled grenade attacks and six roadside bombings .