### Chinese: 小时候，幸福是一件东西，拥有就幸福； 长大后，幸福是一个目标，达到就幸福； 成熟后发现，幸福原来是一种心态，领悟就幸福。
### English: When I was young, happiness was a thing, it means happiness if you possessed it; when you grew up, happiness is a goal, and you can achieve them; when you mature, you realize that happiness is a state of mind, and happiness is all understanding.
### Errors: There is a minor error at "I". There is a major error at "it means happiness if". There is a major error at "possess". There is a major error at "can achieve them". There is a minor error at "happiness is all understanding".

### Improved English: When we were children, happiness was a thing, and we were happy when we had it; when we grow up, happiness is a goal, and we will be happy when we reach it; after maturity, I found that happiness is actually a state of mind, and understanding is happiness.