underofficer

例句：

1. 1. He was promoted to underofficer after completing his training.
   他在完成培训后晋升为副官。
2. 2.The underofficer was responsible for overseeing the construction of the new building.
   这位副官负责监督新建筑的建设工作。
3. 3.Underofficers are often assigned to assist with the daily operations of the department.
   副官通常被分配来协助部门的日常运营。