灾难事件正对有限的医疗公共卫生资源提出严峻挑战，并日益对其提出更多的要求。

Public medical health resource in China could not sufficiently adapt to mass disaster events that need to be optimized to a higher level.

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在最近的一项研究中，斯蒂芬·桑德斯·韦伯对这一观点提出了严峻的挑战。

In a recent study, Stephen Saunders Webb has presented a formidable challenge to this view.

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这就对招聘经理提出了严峻的挑战，尤其是对于那些不熟悉社交媒体的招聘经理——毕竟社交媒体领域刚刚诞生五年，谁敢说自己是个专家呢？

It presents a serious challenge for hiring managers, especially those unfamiliar with social media — in a field less than five years old, who can really claim to be an expert?

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