VOA慢速英语:New Study Links Using Facebook and Living Longer(翻译)

socialize - v. to talk to and do things with other people in a friendly way

mortality - n. the quality or state of being a person or thing that is alive and therefore certain to die : the quality or state of being mortal

dementia - n. a mental illness that causes someone to be unable to think clearly or to understand what is real and what is not real

cardiovascular - adj. of or relating to the heart and blood vessels​

postdoctorate - adj. a postdoctorate student is an individual holding a doctoral degree who is engaged in mentored research and/or scholarly training for the purpose of acquiring the professional skills needed to pursue a career path of his or her choosing.

associative - adj. of or involving the action of associating ideas or things

causal - adj. relating to or showing the cause of something