VOA慢速英语:研究人员对贫富之间的“鸿沟”感到震惊

palliate – v. to moderate the intensity of : palliative – adj.

mastectomy – medical n. : surgical removal of all or part of the breast and sometimes associated lymph nodes and muscles

horror – v. the quality of something that causes feelings of fear, dread, and shock : the horrible or shocking quality or character of something

agony – v. extreme mental or physical pain

tracer – medical n. : a substance that is put in a patient's body so that doctors can watch a biological process (such as digestion) or see how a condition (such as cancer) is progressing

access – n. freedom or ability to obtain or make use of something

vast – adj. very great in size, amount, degree, intensity, or especially in extent or range

dose – n. the amount of a medicine, drug, or vitamin that is taken at one time

distribute – v. to give out or deliver especially to members of a group