Have you ever thought about what kind of job you would like to have when you grow up? Many people think that we can have only one job in our lifetime. We all know that this is not true, but quite a few people actually think this way. For example, when people choose a major（专业）in college, they think that the decisions they make now will decide their jobs for the rest of their lives. However, there are many examples where people became successful after changing their careers（职业）later in life.

J. K. Rowling, the writer of the famous novel Harry Potter, was actually a school teacher before she began writing books. In fact, she was out of work before the first Harry Potter book came out.

Former US President Ronald Reagan began as an actor when he was a young man. He later decided that he wanted to do political work. This kind of passion（激情）finally led him to become President of the United States.

The famous 19th century artist Vincent Van Gogh was not a painter from the beginning. He once worked as an art salesman and later became a preacher. It was only 10 years before he died that he decided to become an artist.

Careers are always open to change. The important thing is to find what you are really good at or what you really want to do. Once you find that passion, it's all a matter of how hard you try.