Experts say they are "silent killers", either because they do not work or contain harmful substances.
专家声称它们是“寂静的杀手”， 因为它们没有效用或者是含有有害物质。
They are already zipping through your body every second, and they could end up being our silent killers.
他们已经压缩和解，通过你的身体每一秒，他们可能最终会被我们无声的杀手。
According to Dr Ackerley, the worst bacteria in our homes are 'silent killers' that we cannot see or smell but that can multiply from a single bacterium to several million in just seven hours.
据阿克力博士称，我们居家最糟糕的“隐形杀手”细菌要数那些我们看不到也闻不到但是却可以在七个小时内从单一的个体繁殖成成千上万的细菌群了。
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