隐孢子虫：这种具有抗氯性的寄生虫是游泳池中导致肠胃炎爆发的主要原因，根据CDC的报告，即使在氯浓度合格的池子里，它也可以生存好几天。
Cryptospordium: This chlorine-resistant parasite is the leading cause of gastroenteritis outbreaks at swimming pools, and can live for days in even properly chlorinated pools, according to the CDC.
结果武钢粉尘总合格率为86.35%，其中轧钢系统的平均粉尘浓度合格率最高，炼铁最低；
Results The total compliance rate of dust is 86.35%, among them the average dust concentration in rolling plants is the lowest and in iron-smelting plants the highest.
该厂自1965年采用防尘措施以来，粉尘浓度有了显著降低，测尘点合格率遂年增多。
Since the factory took measures to prevent dust in 1965, the ust concentration has been reduced greatly.
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