Article 209 execution work shall be carried out by the execution officer.

第二百零九条执行工作由执行员进行。

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After the execution is completed, the execution officer shall make a record of the particulars of the execution, and have it signed or sealed by the persons concerned on the scene.

执行完毕后，应当将执行情况制作笔录，由在场的有关人员签名或者盖章。

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He was arrested for obstruction of a police officer in the execution of his duty.

他因妨碍警察执行公务而被逮捕。

《牛津词典》

Andrew Young QC, for the Duke of Buccleuch, called it "a rather bizarre attempt" to fix a contract on the duke for something an undercover officer did in the execution of his normal investigatory role.

BBC: Marshall Ronald

In August 2002 Mr Fox cancelled a visit to the ranch in protest at the US state's execution of a Mexican national who killed a US police officer.

BBC: Greenpeace protester