1. The artist's work pushes our civilization to a higher level.
改进：Artists' work upgrades our civilization.
2. For example, you work in a big factory.
改进: Suppose you work in a big factory.
3. You'll find you are fit for business and you can make it your main
job.
改进：You'll find that you are cut out for business and you can make
it your career.
4. We will own nothing at all if we depend on luck.
改进: We will get nowhere if we rely on luck.
5. He will get a higher salary to improve his living level.
改进: He will get a higher salary, thus improving his life.
6. Their brain is still very young.
改进: They are still immature.
7. Dissatisfaction makes people produce desire for better things.
改进: Dissatisfaction impels people for the better.