现在，在大多数学校中，两种足球运动都在开展。

Now, both kinds of football are played in most schools.

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本文通过对青少年足球运动员50米直线跑和两种不同变向跑速成绩进行比较研究，探讨其内在的规律。

By comparing the scores of 50metre linear running and that of the dual directions of running, the essay discusses the internal regularities between them.

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