AK-47       
noun [ C ] (also AK 47, AK47) uk/ˌeɪ.keɪ.fɔː.tiˈsevən/ us/ˌeɪ.keɪ.fɔːr.t̬iˈsevən/
 一种突击步枪,原产于苏联
a type of assault rifle (= a light gun with a long barrel that can fire many bullets quickly) originally made in the Soviet Union
  Five people armed with AK-47s manned the roadblock. 五名手持 AK-47 的人守在路障上。 
 The gunmen opened fire with AK 47 rifles. 枪手用AK 47步枪开火。 
 Synonym: Kalashnikov
 - More examples
 - The humvees are built to halt armour-piercing 7.62-mm rounds - the kind of bullets fired from AK- 47s.
 - A fighter with an AK 47 guards the mountaintop.
 - Each of us was given a sack containing 8 grenades, one AK47 rifle, 200 cartridges, two magazines and one mobile phone for communication.
 - A burst of gunfire from an AK47 assault rifle ripped through the mobile home where the family slept.