officer可數嗎

　　He had hoped to continue as a full-time career officer.

　　他原本希望繼續當全職警官。

　　He behaved like an army officer crossed with a professor.

　　他的舉止既像軍官又像教授。

　　He got permission from his commanding officer to join me.

　　他得到了指揮官的允許與我會合。