Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
calcium – n. a substance that is found in most plants and animals and that is especially important in people for strong healthy bones
artery – n. any one of the tubes that carry blood from the heart to all parts of the body
atherosclerosis – n. a disease in which plaque builds up inside the arteries. (Plaque is a harmful material that can form in arteries and be a cause of heart disease.)
cardiac – adj. of or relating to the heart
dot – n. a small amount
marked – adj. very noticeable
elevated – adj. higher than normal
coronary – adj. of or relating to the heart and especially to the vessels that supply blood to the heart
risk factor – n. something that increases risk
cholesterol – n. a substance that is found in the bodies of people and animals
modest – adj. not very large in size or amount
cohort – n. a group of people used in a study who have something (such as age or social class) in common
