This normal human reaction is used to protect us by signaling danger and preparing us to deal with it.

人类的这种正常反应是用来保护自身的，这种反应向我们发出危险信号，让我们做好应对危险的准备。

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The title compound has been obtained by the reaction of copper powder with sulfur powder, potassium sulfide and 3-methylpyridine at ambient temperature and normal atmosphere.

采用铜粉、硫粉、硫化钾及3-甲基吡啶在常湿、常温下直接合成了标题化合物。

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But equities analyst Alec Young at Standard and Poor's says the declines are part of a normal market reaction.

VOA: standard.2010.05.21

Remind yourself that the physical reaction is normal, and take deep breaths, counting up and down from four.

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Tell yourself that this is a normal reaction and it will go away shortly.

WSJ: After Fatal Manhattan Elevator Accident, Elevator Fear Is Common

The normal reaction would be to try to match-up the colors, hide the joints or otherwise mask the problem.

FORBES: Connect