Often, these solutions were built as a reactive response versus a planned approach and, as a result, the solutions were often limited in flexibility and resilience.
通常，这些解决方案被构建为一个反应性响应，而不是事先规划好的方法，因而，这些解决方案通常在灵活性和弹性方面存在局限性。
They move from a reactive response to outbreaks at borders and points of entry, to a proactive response aimed at snuffing out a threat at source, before it has a chance to spread internationally.
《条例》从被动地应对边境和入境口岸的疾病暴发转向积极主动地作出反应，目的是在出现国际传播机会之前，从根源上消除威胁。
An over-reactive immune system is also the cause of allergies, where a harmless agent (such as pollen) can lead to an unnecessary immune response.
过激的免疫系统也是引起过敏的原因，本来无害的物质(如花粉)会引起不必要的免疫反应。
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