Without the fight-flight reaction, man would never have survived the cave and the jungle.

人类作出争斗或逃避的反应使其在远古时代得以在洞穴或丛林中生存。

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The amygdala plays a role in responding to threats, and it can kick off a fight-or-flight reaction when it senses danger.

杏仁体之所以被称为“恐惧中枢”，是因为它能感应到危险并触发“打或逃”反应。

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In most animals, a serious threat causes a fight-or-flight reaction, but once the danger has passed, the brain circuitry stops flaring and they return to a state of rest.

对于大多数动物而言，一个严重威胁会引发一场战斗或逃跑反应，但是一旦危险过去，大脑就会停止发出威胁信号，他们也就返回到休息状态。

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His government, however, had a very different reaction when an Indian Airlines flight was hijacked to Afghanistan last December.

CNN: ASIANOW - TIME Asia | Afghanistan: Destination Unknown

When we hold our breath, the brain is momentarily oxygen deprived and hits the flight or fight response, fueling a more emotional reaction to the words shooting out of our fingers.

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Giancarlo Abete, president of the country's football federation (FIGC), announced the suspension of Serie B and C matches at the weekend, but international matches are taking place this week with no top-flight matches taking place, which has led to some commentators critical of such a weak reaction.

CNN: Insider's guide: Italian football violence