这些变化对于大多数人来说都是有益的，对于取得优异的运动成绩也必不可少。

For most people, these changes are beneficial and also necessary for successful athletic performance.

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随着国际田联《田径竞赛规则》每两年修改一次，现代田径竞赛越来越有利于运动员创造优异的运动成绩；

With the IAAF athletic competition rules being revised biennially, modern athletic competition became more and more benefit to athlete to achieve the best performance.

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B我想中国运动员将在马拉松比赛中取得优异的成绩。

B I think Chinese athletes will do really well in the marathon.

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