It perfectly explains what it means to die without dying. The girl swims upstream and downstream just to wait in the cage. I can understand that the rope that stretches down is so thin that she is playing with the two sisters? In order to enhance the readability of the story, I made up my own brain for a man on the boat who had a grudge against the two sisters, and deliberately teased them up and down. By the way, I forced myself to understand why the first time the sharks just swam by and the cage fell...because I didn't want them to live at all.
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