officer可数吗

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

　　他原本希望继续当全职警官。

　　He behaved like an army officer crossed with a professor.

　　他的举止既像军官又像教授。

　　He got permission from his commanding officer to join me.

　　他得到了指挥官的允许与我会合。