单词gerontologist
n.: 老年学专家
网络: 老人学家;老年医学家;老年病学家
老年学专家:
a person who studies the process of people growing old
老年病学家
Floss your teeth The gerontologist Dr Michael Roizen claims that flossing your teeth every day can add six years to your life.
用牙线清洁牙齿。老年医学家迈克尔罗伊森博士称每天用牙线清洁牙齿能多活6年。