In performance of this sacred duty he blundered now and again, did certain things incorrectly, and others which he did correctly were done over and over.

在履行这个神圣的职责时，他跌跌撞撞，做错了一些事，又重复一遍又一遍地做已经做过的正确的事。

youdao

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

If a defendant fails to perform or delays the performance of his statutory duty, a fixed time shall be set by judgment for his performance of the duty.

被告不履行或者拖延履行法定职责的，判决其在一定期限内履行。

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

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)

"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

It's one of Sammy's higher-end ultraportable, available in Core i5 and i7 configurations and a choice of 128GB or 256GB SSDs, not to mention a 1GB AMD HD8570M GPU. That definitely smacks of heavy-duty performance -- compared to many Ultrabooks on the market, at least.

ENGADGET: Samsung Series 7 Ultra hands-on Hands-on