她的富有感染力的笑声打破了沉默。

Her laughter, which was very infectious, broke the silence.

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感染这些病毒初期并没有任何症状，因而这种感染是一种沉默的流行病。

Because infection with these viruses initially presents no symptoms, it is a silent epidemic.

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随着时间的进展，这种“沉默的”慢性HPV感染增加了某些癌症发生的危险。

Over time, this "silent," chronic HPV infection increases the risk of developing certain cancers.

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