reservist

例句：

1. 1. The army has a large reserve of soldiers ready to be called upon at short notice.
   军队拥有大量待命的后备士兵。
2. 2. The reserve forces were deployed to the border for emergency response.
   预备役部队被部署到边境进行紧急响应。
3. 3.The reserve officer was promoted to the rank of major after completing his training.
   预备役军官在完成培训后晋升为少校。