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本文用一个简化的物理模型描述短跑。用以说明在直道和弯道上赛跑时间是不同的,并指出:道次的选择会造成不可忽视的差别。
This article uses a simplified physical model to describe dash. It shows that the running time is different on the straight road and the curve, and points out that the choice of the road can cause the difference that can not be neglected.