Since the start of the FINA Worlds, the sisters have delivered seven performances in the preliminaries and the finals.

According to Qianyi, a key to success was the winter training plan formulated by the coach, which has laid a very good foundation for them.

"In terms of physical fitness, both of us have greatly improved. The coach gave us a solid training and gave us a lot of trust. We are encouraging each other too," she said.

On Friday, the sisters will compete in the team free final, which is their last event in the Championships. Wang Liuyi said: "We hope to be able to work together with our teammates in the final tomorrow, to have a better performance and achieve better results."

"The World Championships is a big test for us. We hope to play steadily, step by step, and do a good job. I believe that no matter what kind of difficulties we encounter, we can overcome them," Qianyi added.