这是大流行期间常见的显著现象。

This phenomenon is distinctly seen during pandemics.

彼得是个有主意的人，从不随年夜流。

An independent man, Peter never goes with the tide.

这意味着系统的性质，用以描述系统的性质，不随时间或空间改变。

It means that the properties of the system, the properties that describe the system, don't change in time or in space.

世卫组织的流感大流行政策和反应未受到制药业的不当影响。

The WHO influenza pandemic policies and response have not been improperly influenced by the pharmaceutical industry.

但公司无法轻易将生产规模从年产400万支常规流感疫苗扩大到流感大流行期间所需的数十亿产量。

But companies cannot readily scale up the process from the 400 million doses of regular flu vaccine they make each year to the billions needed in a pandemic.