Definition
Occurring while someone is performing their job or duties.
因公
The firefighter was seriously injured in the line of duty.
这名消防员在执行任务时受了重伤。
Many soldiers have lost their lives in the line of duty on the battlefield.
许多士兵在战场上执行任务时失去了生命。
She believes that police officers must maintain strict discipline in the line of duty.
她认为警察在执行任务时必须保持严格的纪律。