•The United Nations has used/exerted/exercised its authority to restore peace in the area.联合国行使其权力以恢复该地区的和平。

•We need to get the support of someone in authority (= an important or high-ranking person).我们需要得到一个有实权的人的支持。

•They've been acting illegally and without authority (= permission) from the council.他们的行动都是非法的，而且没有得到市政委员会的授权。

•[+ to infinitive] I'll give my lawyers authority (= permission) to act on my behalf.我将授权我的律师代表我处理。

•He's got no authority over (= ability to control) his students.他在学生面前没有威信。

•She spoke with authority (= as if she was in control or had special knowledge).她说话时一副权威的口吻。

•the health authority卫生当局

•the local housing authority当地住房管理机构

•I'm going to report these holes in the road to the authorities.这条路路面坑坑洼洼，我要把这一情况报告给有关部门。

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•She's a world authority on 19th-century Irish history.她是19世纪爱尔兰历史方面的国际权威。

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•I have it on good authority that she's getting married.根据可靠的资讯，她就要结婚了。