What did you /your friends see there? What did you /your friends learn there?

I saw the wonderful sea. The ugly water pollution is always in our country. The harm pollution affects our body. The poison penetrate into the water and poison the human body.My friends also saw the wonderful sea. The water is a little dirty. Recycle is a bailout for the ecological environment.I learned that you had to be careful with beautiful nature. I will take care of nature.My friends learned that you had not to pollute beautiful nature. They will now follow the purity of nature.