Write a composition of marine animals in 270 words.

Every summer, I travel to Qingdao, because dolphins in the polar ocean world are one of my favorite marine animals. Like my friend, I go to see it every year.

Accompanied by beautiful music, I walked into the Dolphin Performance Hall again. I saw five lovely dolphins following their trainer. They wear bright gray coats and white shirts, their mouths are flat and short, their tails are like the wings of a big butterfly, their fins flap back and forth, and they sing melodious "songs" from time to time, as if welcoming us.

Dolphins are friends of human beings, and they can live in harmony with us. You see, it dances in circles with the trainer for a while and hula hoop with the audience for a while, which is even more powerful than us!

Dolphins are the most interesting. They swam in the water, suddenly jumped out of the water, gently touched the ball hanging in the air with their tails, and the ball immediately shook.

Although dolphins are heavy, they can jump skillfully. They suddenly jumped out of the water and fell quickly, and the audience was full of praise.

Finally, a dolphin flew in the air and pulled the rope on a red ball. The red ball immediately opened and a red cloth hung down, which read "Qingdao, Shandong, polar region, happiness is just around the corner."

Seeing the animal trainer gently touching their heads, I also want to touch them! Yes, how hard the lovely dolphins have made to make people smile! In order to make people happy, they train hard and can't go back to the sea. What a pity! I really want to put them back in the sea and let them be free and happy.

Looking at the lovely dolphin, I seem to have a beautiful picture in front of me: the dolphin is no longer a tool to make people happy, but has returned to my home. I stood by the sea and gently called for dolphins. It slowly approached me, took me to swim freely in the sea and played with me in the sea. ...