Endorphins, a known substances produced in brains is an opioid receptor agonist which the brain produce in the presence of pain stimulus.是什么意思_Endorphins, a known substances produced in brains is an opioid receptor agonist which the brain produce in the presence of pain stimulus.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句