1) When I was still a juvenile,I'd dreamt that I could save the world like they did.
2)But adults told me that was just a fantasy.
3)They are not only(这句的时态不确定,因为不知文中你是几时说的)heroes,but symbols of courage and persistence in our heart.
4) Every one can be a hero of himselves.So far as you can face and resist the obstacles you encounter in your life.