Vaccine researchers counter that some people might have immunity lasting at least a few years. And a vaccine can teach the immune system to do things it might not be able to do on its own.

疫苗研究人员反驳说，有些人可能至少获得持续几年的免疫力，而且疫苗能够教会免疫系统做它自己做不到的事情。

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New Zealand has tried to counter this by boosting the powers of a state-services commissioner, whose duties include one of lasting "stewardship".

为了应对这个问题，新西兰尝试着提升其国务理事的权力，他们的指责之一包括永久的“管理工作”。

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