someone who studies diseases and how they are found, spread, and controlled in groups of people

Snowdon is an epidemiologist studying the causes of Alzheimer's disease. 斯诺顿是一位研究阿尔茨海默症病因的流行病学家。

Epidemiologists who led the study say leafy greens and colourful vegetables are especially potent cancer fighters. 领导这项研究的流行病学家说，绿叶蔬菜和五颜六色的蔬菜富含抗癌剂。