Introduction to simulated roller coaster: As the sea water fluctuates, the drift bottle enters a vague door, and Xiaohai finally reaches home. In order to express his gratitude, Xiaohai treated Huanhuan and his party with the highest standard of courtesy from the family. Xiaohai first led them to the 4D theater with the highest technological content in the family. As soon as they sat down in their chairs, they found that the world was flying towards them quickly, spinning, jumping, flying, sometimes rushing to the sky, sometimes flying to the deep sea. It's like being on a roller coaster.