a machine gunner的用法和样例：
- The mechanic became a machine gunner and survived.
- A Machine Gunner will now have to kill substantially more Zulus to qualify for above average performance.
- The machine gunner fired off two magazines without a break.
- Organize anti-tank hunter-killer teams which include a machine gunner and a sniper to protect the anti-tank gunner by suppressing infantry which is accompanying the armored vehicles.
- A machine of faulty design will not sell well.