They scrape their knee, they have a big test coming up, they're going through puberty.

他们有时候会摔伤膝盖，有大考来临，会经历青春期。

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The sure-fire test for runner's knee: sit down and put your leg out on a chair so that it's stretched out straight.

确诊的方法：坐下来，将一条腿伸直放在椅子上。

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The differences of Isokinetic test results of knee muscle groups is the reason made different levels of elite or sub-elite high jumpers.

结论：跳高运动员膝关节肌群等速测试结果的差异是造成一、二级跳高运动员成绩差异的原因之一。

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Nel will be replaced by Dale Steyn or Makhaya Ntini, who has had a cortisone injection in his knee and faces a test to decide if he can rejoin the tour.

BBC: SPORT | Cricket | Nel faces lengthy injury lay-off

The first came through West Ham midfielder Jack Collison who started after passing a late fitness test on a knee injury.

BBC: Wales 0-1 Sweden

For Stoudemire, who has a history of knee problems, the biggest test now will be to build on his health and performance.

WSJ: New York Knicks: This May Take Some Time