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Pronunciation Guide
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Some people also have a more sensitive cortisol break, which shuts it down more quickly, and that that seems to have an epigenetic component meaning.
Some earlier life experiences may have primed the system to be say, not reactive enough or over reactive in terms of shutting it down.
All of that is hard to demonstrate in research but that seems to be an emerging idea.
Listen to native speakers pronounce “over reactive” in real conversational contexts with synchronized timestamps and subtitles.