threshold of substance 阈质
threshold substance
阈值的物质
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Antidoping officials say the test was new at the time, so the threshold for triggering a positive result for the banned substance was set conservatively high, and would later be lowered.
WSJ: Antidoping Officials Pursued Armstrong for Years
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