就是介绍职业,是什么,描述一下（警察）policeman :to make the society peaceful,catch thieves,keep the traffic running well 等,再谈谈你因什么而喜欢上这个职业如 one day I talked with my uncle ,who is a policeman ,he told me a exciting story about the fighting between policemen and badeggs.From then on ,I show great interest in this job.为了这个职业你打算怎么做：work harder and harder to achieve my dream job .等
不一定要写警察,大概用上这个思路就行了,你还可以借用一下有用句型.