炮兵下士

例句：

1. 1.He is a well-trained cadet, serving as a gunner in the army.
   他是一名受过良好训练的学员，在军队中担任炮手。
2. 2.The young soldier was promoted to gunner after completing his training.
   这位年轻的士兵在完成培训后被提升为炮手。
3. 3.In the battlefield, the gunner played a crucial role in protecting the soldiers' lives.
   在战场上，炮手在保护士兵生命方面起到了至关重要的作用。