一系列产业研制的不断升级换代的疫苗具有短期保护作用，但其代价是引惹流感以不可预测的方式演变。
An ever-escalating array of industry-developed vaccines confer short-term protection, but at the expense of provoking flu to evolve in unpredictable ways.
关键在于要调优主导产业，充分发挥产业升级换代的主导作用。
The key is to optimize the leading industries and sufficiently perform the leading function of the industrial upgrade and regeneration.
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