the legal punishment of killing someone

Execution is still the penalty in some states for murder. 在一些国家，犯谋杀罪的人仍然被处以死刑。

The executions will be carried out by a firing squad. 将由行刑队来执行枪决。

the act of doing or performing something, especially in a planned way

Sometimes in the execution of their duty the police have to use firearms. 有时为了履行职责，警察不得不使用武器。

Although the original idea was good, its execution has been disappointing. 尽管最初的想法很好，但真正做起来却令人失望。