他们可能是被动地参与，可能只是看到了某一个事件，但他们的肾上腺素没有分泌那么多，个人身体没有受到威胁。
They might be more passively involved, having just maybe viewed an incident, but they don't have that adrenaline pump, not being personally threatened.
《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。
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.
近些年来，被动吸烟逐渐成为了一个公共健康的威胁。
In recent years, secondhand smoke has emerged as a public health threat.
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