In the case of a new influenza pandemic, the huge number of patients seeking care will pose a challenge to health services and greatly increase the risk of spread within health care facilities.

在新的流感大流行情况下，寻求医疗的大量患者将对卫生服务造成挑战并可极大增加卫生保健设施内传播的危险。

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If this new finding about Venus stands up under further study, it will pose a definite challenge to our knowledge of how the planets were formed.

如果对金星的这个新发现作进一步研究的话，将会对我们的有关行星起源的知识提出明确的质疑。

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As NGO work is dependent largely on donor funding, donors who change their priorities can pose a real challenge to the NGO because it then has to source new donors.

UNESCO: The Family Literacy Project