This paper analyses on the reasons of the speed reduction in 100 meter's latter half running, and puts forward some solving methods.

文章分析了百米后程跑减速的原因形成，并提出解决的办法。

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Portugal defender Pepe and Brazil midfielder Felipe Melo were both booked during a running battle, which resulted in the latter being substituted just before half-time.

BBC: Portugal 0-0 Brazil