I believe you have a complaint against one of our nurses.
我认为你对我们的一位护士有怨言。
The police officer was suspended while the complaint was investigated.
投诉调查期间，这位警员被暂停职务。
Portugal has lodged a complaint with the International Court of Justice.
葡萄牙向国际法院提出了申诉。
You may refer your complaint to an independent adjudicator.
你可以向独立裁判投诉。