求翻译：Seven on seven, a vigorous group of hurlers, men and women, line up face to face on the grass pitch, ready to strike; sweat rolls down their faces under the scorching sun. The white disk goes up in the air and the battle begins. "Nice catch! You just missed a major clash, Go for it, go!" the players shout. Eager to clench the white disk, a guy flies horizontally and clashes with a girl jumping high. Teammates sighed from the sidelines as he landed hard on his chest and she left the field staggering in visible pain. Ultimate Frisbee is fast and furious, a combination of speed, strong tossing and style. Passing is the only way the Frisbee can be moved; there's no contact or referee; the fierce squads bend only to the "Spirit of the Game," a blend of self-refereeing and fair play unique to Ultimate Frisbee是什么意思？

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