### 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 we are little children, happiness is a thing that makes us feel happy once we own it; after we grow up, happiness is an objective that makes we happy if we achieve it; when we change mature, happiness is a mentality that makes us happy if we can understand it.
### Errors: There is a minor error at "little". There is a minor error at "own". There is a minor error at "objective". There is a major error at "we change mature". There is a major error at "mentality". There is a major error at "understand".

### 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.