VOA慢速英语:人们什么时候应该做结肠癌检查？

colon – n. the main part of the large intestine

recommend – v. to suggest that someone do (something)

data – n. facts and other information collected for use in studies

stool – n. waste product

symptom – n. a sign or marker of something

polyp -- n. medical : a small mass of a substance that grows inside your body (such as inside your colon or on your vocal cords)

option – n. choice

invasive – adj. medical : involving entry into the body by cutting or by loading or adding an instrument