### 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, and it was happiness to have it; when I grew up, happiness was a goal, and it was happiness when it was achieved; when I matured, I found that happiness was a state of mind, and it was happiness when I understood it.
### Errors: There is a minor error at "it was happiness to have it". There is a minor error at "was happiness". There is a minor error at "was happiness". There is a minor error at "understood".

### 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.