A city officer came to our class to talk about recycling.
一位市府官員來我們班談資源回收。
The officer works at the health department.
那位官員在衛生局工作。
I wrote a letter to an officer at city hall.
我寫了一封信給市政府的一位官員。
The officer explained the new bus rules to us.
那位官員向我們說明新的公車規定。