B2 a person in the armed forces who has a position of authority军官
B1 a person who has a position of authority in an organization长官;官员
B1 a member of the police force(警察的头衔或称呼)警官
More examples
The officer commanded his men to shoot.
Inasmuch as you are their commanding officer, you are responsible for the behaviour of these men.
The police have appointed a liaison officer to work with the local community.
Every available officer will be assigned to the investigation.
There was a record number of confiscations by customs officers last year.
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