那位警官在警察局帮我录了口供。

The ___officer helped me file a report at the station.

如果你看到任何可疑情况，请打电话叫警察。

Please call an ___officer if you see anything suspicious.

一名交通警察在事故现场指挥车辆绕行。

A traffic ___officer directed cars around the accident.