Many years ago, I liked to go to the zoo very much, because I could see all kinds of animals.

Many years ago, I liked to go to the zoo very much, because I could see all kinds of animals. But since I learn that the animals should return to the nature and live with freedom, I start to refuse to go to the zoo. I think it is not good for the animals to be prison there. If people not take this for fun, it can help to protect them. 
许多年前，我非常喜欢去动物园，因为我可以看到各种各样的动物。但自从我得知动物应该回归自然，自由地生活，我就开始拒绝去动物园。我认为囚禁动物是不好的，如果人们不把这当作一种乐趣，就可以帮助保护动物。