Whatever I see or hear of a confidential nature or that is confided to me in my official capacity will be kept ever secret unless revelation is necessary in the performance of my duty.

对于我所看到的、听到的或工作上委托于我的任何具有机密性质的事情，我都要做到永远严守机密，非工作需要决不泄露。

youdao

The performance of Direct Sequence Spread Spectrum(DSSS) in severe pulsed noise interference will be badly degraded when the duty factor is small.

当脉冲干扰占空比较小时，干扰能量集中，导致直接序列扩频（DSSS）系统的误码性能较差。

youdao

He failed completely in the performance of his duty.

他完全没有履行他的职责。

youdao

I did not intend to fight unless it became necessary in self-defense and in the performance of official duty.

VOA: special.2010.02.15

"Since crime began its steady downward slide in 1992, more than 1, 100 federal, state and local law enforcement officers have lost their lives in the performance of duty, " Floyd said.

CNN: Coffins

In the Santa Monica case, Lohan is accused of giving false information to a police officer, obstructing or resisting a police officer in performance of his duty, and reckless driving, according to the city attorney's office.

CNN: January 7, 2013 -- Updated 0745 GMT (1545 HKT)