The positive tests came amid a recent re-testing of 454 doping samples from the 2008 Beijing Olympics.

国际奥委会最近对来自北京2008年奥运会的454份兴奋剂检查采样进行重新测试。

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In addition, the multifunctional properties of such materials are strongly affected by using the different rare-earth (re) doping methods.

此外，研究发现不同的稀土元素掺杂方式对材料的多种功能性也可以产生重要影响。

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After Bilonog narrowly beat Nelson for the gold at the 2004 games, his doping sample was stored, then re-tested last year with new technology.

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Dr. DON CATLIN (Executive Officer, Anti-Doping Research Institute in Los Angeles): The fact that we're making solid progress is very, very exciting to me.

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"The message to athletes is 'We're going to get you', " he declared at a briefing on anti-doping policy ahead of the Games.

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