求翻译：A fleet of about 30 white discs flies over the green at a sports complex in Shunyi as the 5th annual Beijing Ultimate Summer League (BUSL), themed "Once upon a Summer in Beijing," kicked off last Saturday. For the next six weeks, with an extended final week for a 3rd-place game and finals, Beijing Ultimate will get together every Saturday starting with a beginners/intermediate clinic and hat tournament. The final is Aug 13th.是什么意思？

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