Explain the theory of the switching matrix and jumping line, with practice application explain the use of switching matrix and jumping line in particular.

介绍切换矩阵和跳线的原理，结合实际应用详细讲解切换矩阵以及跳线的使用方法。

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They are all standing on the same balk line and jumping point, but the problem is "who will be the best?"

他们站在同一个起跑线上、同一个弹跳点上，关键是：谁会出类拔萃？

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The kids would line up on one side and take turns running and jumping over it.

孩子们在绳子的一边排好队，然后轮流跑向绳子，跳过绳去。

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