Therefore, research on the arena of the China's large-scale track and field event is an extremely necessary work to do.

为此，对我国大型田径赛事赛场风险进行相关的研究是一项极其必要的工作。

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Organisers had planned to scale down the stadium following the Olympics, converting it from an 80, 000-capacity arena to a 28, 000-seater track and field venue.

BBC: Deadline set for 2012 London Olympics stadium bids