预警系统分2个级别，红色信号属I级，表示细菌性食物中毒概率大于25%，黄色信号属II级，表示中毒概率为15% - 25%。
A red alert will mean a 25% or more risk of bacterial food poisoning, while a yellow alert will warn of a 15%-24% possibility.
有没有想过，洗澡可能对你的健康有害，美国科学家如是说，他们表示脏的喷头可能会让你的脸满是有害细菌。
Showering may be bad for your health, say US scientists, who have shown that dirty shower heads can deliver a face full of harmful bacteria.
但是如今美国宇航局研究团队表示，他们已经证明这些细菌不是爆炸本身造成的。
But the Nasa team is now saying they have proved that they could not have been produced by the blast itself.
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