名词
中文翻译：背景掺杂物
同义词：
['background contamination', 'background pollution']
例句：
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1. The athletes were tested for the presence of background doping agents.
运动员被检测是否有背景掺杂剂。
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2.The company is under investigation for possible background doping in its products.
该公司因产品可能存在背景掺杂物而受到调查。
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3. The researcher found that the use of background doping could have serious consequences on the health of the athletes.
研究者发现，使用背景掺杂物可能对运动员的健康产生严重后果。