His heart was racing as if he had been sprinting and had just cleared an enormous obstacle.

他心跳得很快，好像他一直在狂奔，刚刚越过一个巨大的障碍。

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Spartan Race is part of a new sport called obstacle racing.

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In jump racing of all types, and particularly in steeplechases, the first obstacle is often the most perilous because the horses haven't gotten into rhythm.

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