结果，为稳妥起见，公司为产品放上警告的标签，而那个产品中也许其实并不含有会产生后果的足量过敏原。
As a result companies play it safe and put warning labels on products that may not in fact contain high enough levels of allergen to have any effect.
英国过敏症研究专家警告说，在室内，到处充满了只有用显微镜才能观察到的发霉的过敏原，而这些过敏原是无法用肉眼识别的。
Everywhere in the house there will be microscopic mould allergens, unable to be seen by the naked eye, warn the experts at Allergy UK.
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