1.职业n.

He lost his occupation last month.

2.占据v.

The Japanese occupation of Taiwan lasted fifty-one years.

3.be in occupation of占有，居住，占领

be in the occupation of为~占有，为~居住，为~占领

The enermy was in occupation of my hometown.

4.by occupation职业上

He is a teacher by occupation.

注意：不能说His occupation is a teacher.