Still, the sheer volume of pollutants, including benzene, means they pose a real risk – of worse symptoms and even death – to asthmatics and those with chronic obstructive pulmonary disease.

但是，大量的污染物质（包括苯）注定会对哮喘患者以及那些患有慢性阻塞性肺病患者构成真正的风险——使症状恶化，甚至导致死亡。

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Good tracing and management of contacts helps to ensure that possible cases are isolated prior to the onset of symptoms, when the risk of transmission to others is highest.

良好的接触者追踪和管理有助于确保当向其他人传播的危险最大时在症状出现之前将可能病例隔离。

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The fact that infected people can shed virus before symptoms appear adds to the risk of international spread via asymptomatic air travellers.

被感染者在症状出现之前已开始传播病毒，这就加剧了通过无症状航空旅客造成国际传播的危险。

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As part of their awareness campaign, Prostate Cancer Research is encouraging more men to talk about the disease and is raising awareness of the risk factors and symptoms that men, their wives and mums should be looking out for.

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Since she reportedly never contracted chicken pox as a child, she was at higher risk for developing severe symptoms and complications including pneumonia.

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Margaret Edwards, of the mental health charity Sane, agreed that bipolar could be difficult to diagnose - and carried a high risk of suicide when symptoms went untreated.

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