endorphins 
内啡肽
- When a risk taker begins (taking risks) his body shoots endorphins into his system. It's a type of morphine, it makes them feel good.
- The device, which resembles a hearing aid, supposedly stimulates production of pain-killing endorphins in the body, says Dr. Diamond.
- The pain increased as the endorphins were shut out, Etscorn said.
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