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.
我们正在研制一种心室辅助径流泵，可在体外循环中代替血泵使用，也可作为心衰病人短期心脏辅助泵使用。
We are developing a centrifugal ventricular assist pump, as an alternative to the roller pump for cardiopulmonary bypass, or as an short-term cardiac assist pump for patients with heart failure.
为解决以往试采方法只能录取产量资料而不能同时测得井下流压资料问题，根据短期试采要求，研制出套管捞油测压工艺和开式试采工艺。
According to the request of short period production test, the bailing oil in cased well for pressure testing and open oil extraction technique have been developed.
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