VOA慢速英语:研究发现有些人的大脑老化得更快

PET scan – n. medical : an image made using positron emission tomography, especially one of the brain.

inflammation – n. medicine : a condition in which a part of your body becomes red, swollen, and painful

cognitive – n. medical : of, relating to, or being conscious intellectual activity (as thinking, reasoning, remembering, imagining, or learning words)

aerobic – adj. of exercise : strengthening the heart and lungs by making them work hard for several minutes or more