请根据《曹冲称象》的故事,写一篇英语短文,描述你成功解决困难的一次经历。短文内容应包含以下要点提示,可适当发挥,60～80词。
写作要点：
1. What was the problem?
2. What did you do to solve it?
3. What did you learn from it?
______

Once, I wanted to move a big and heavy box alone, but it was too heavy for me to lift. Just like Cao Chong used stones to replace the elephant's weight, I thought of a way. I used a small cart to move the things in the box little by little. Finally, I moved all the things. From this experience, I learned that when facing difficulties, we should think actively and try different ways to solve them.