A defining characteristic of a pandemic is the almost universal vulnerability of the world's population to infection. Not all people become infected, but nearly all people are at risk.
流行病的一个定义特性是它几乎能导致全球人口被感染，不是所有人都会被感染，但所有人有面临着被感染危险。
Unfortunately, a universal vaccine will not be ready soon enough to combat a possible pandemic from the new strain of swine flu that has already sickened thousands of people.
遗憾的是，通用流感疫苗不能及时研制成功来抑制可能的流感大流行，而新的猪流感病毒已经使数千人患病。
An influenza pandemic is caused by a virus that is either entirely new or has not circulated recently and widely in the human population. This creates an almost universal vulnerability to infection.
流感大流行由全新的一种流感病毒或最近未在人群中广泛流行的一种流感病毒引起，几乎无人对其有免疫力。
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