a chemical produced by your adrenal glands that makes your heart beat faster and gives you more energy when you are frightened, excited, or angry 肾上腺素(由肾上腺产生的一种化学物质,能使心跳加快,让人在恐惧、兴奋或愤怒时精力猛增)
Stress gets the adrenalin flowing (=makes you feel excited and active). 紧张使人亢奋异常。